Export to excel with child and grandchild tables

I have a table in Jquery Datatables which has child and grandchild tables (A table with subtables that in turn have subtables) the table is formed as follows:

function cargarTabla() {

    //Función interna para realizar un ajax y obtener las columnas
    mvc.Datos.GetColumnas.post({ IdTabla: idTabla }, res => {
        var datos = res;
        datos = JSON.parse(datos);
        var ruta = idTabla != 17 ? "/Datos/GetDatosPorPuesto?idPuesto=" + idPuesto : "/Datos/GetDatosDocumentacion?idLinea=" + idLinea;

        table = $('#tablaDatos').DataTable({
            "ajax": {
                url: ruta,
                dataSrc: function (data) {                              
                    return JSON.parse(data);                                
                }
            },
            "bDestroy": true,
            "language": {
                "url": "//cdn.datatables.net/plug-ins/1.10.16/i18n/Spanish.json"
            }, select: {
                style: 'multi'
            },
            "iDisplayLength": 10,
            "columns":
                datos
            ,
            "order": [[3, 'desc']],
            "fnDrawCallback": function (oSettings) {
                runAllCharts();
            },
            "columnDefs": [{
                "render": function (data, type, row) {
                    return (data == 1) ? '<center><i class="fa fa-check"></i></center>' : ' <center><i class="fa fa-minus"></i></center>';
                },
            }]
        });
        //botones personalizados para exportacion
        var buttons = new $.fn.dataTable.Buttons(table, {
            buttons: [
                {
                    exportOptions: {
                        columns: [ 1, 2, 3, 4, 5, 6,7,8,9,10,11,12]
                    },                              
                    orientation: 'landscape',
                    title: '',
                    text: '<i class="fa fa-3x fa-file-code" style="padding: 3px 3px 3px 3px"></i>',
                    className: 'btn btn-default jarvismetro-tile txt-color-white btnTablas',
                    attr: {
                        style: 'background-color:#203864;display:none',
                        id: 'exportJSON'
                    },
                    action: function (e, dt, button, config) {
                        var data = dt.buttons.exportData();

                        $.fn.dataTable.fileSave(
                            new Blob([JSON.stringify(data)]),
                            'Export.json'
                        );
                    }
                },
                {
                    exportOptions: {
                        columns: [1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12]
                    },
                    title: '',
                    extend: 'excel',
                    text: '<i class="fa fa-3x fa-file-excel" style="padding: 3px 3px 3px 3px"></i>',
                    className: 'btn btn-default jarvismetro-tile txt-color-white btnTablas',
                    attr: {
                        style: 'background-color:#203864;display:none',
                        id: 'exportXls'
                    }
                }
            ]
        }).container().appendTo($('#buttons'));
    });
}

cargarTabla();

function to generate the subtable and the subsubtable:

$('#tablaDatos').on('click', 'td.details-control', function () {

    var tr = $(this).closest('tr');
    var row = table.row(tr);

    if (row.child.isShown()) {
        // This row is already open - close it
        row.child.hide();
        tr.removeClass('shown');
    }
    else {
        // Open this row



        try {
            var d = row.data();
            var parametros = d.Registros;
            nieto = parametros;

            var subtabla;

            subtabla = '<table id = "child_details" cellpadding="5" cellspacing="0" border="0" style="padding-left:50px;">' +
                '<thead><tr>' +
                '<th></th>' +
                '<th>campo1</th>' +
                '<th>campo2</th>' +
                '<th>campo3</th>' +
                '<th>campo4</th>' +
                '<th>campo5</th>' +
                '<th>campo6</th>' +
                '<th class="hide">campo7</th>' +
                '</tr></thead><tbody>';

            $.each(parametros, function (index, value) {
                subtabla += '<tr><td class="details-control"></td>';
                subtabla += '<td>' + value.campo1 + '</td>';
                subtabla += '<td>' + value.campo2 + '</td>';
                subtabla += '<td>' + value.campo3 + '</td>';
                subtabla += '<td>' + value.campo4 + '</td>';
                subtabla += '<td>' + value.campo5 + '</td>';
                //valores de la tabla nieta
                subtabla += '<td class="hide">' + value.campo6 + '</td>';
                subtabla += '<td>' + value.campo7 + '</td>';

            });
            subtabla += '</tbody></table>';
            row.child(subtabla).show();

            childTable = $('#child_details').DataTable({
                searching: false,
                paging: false,
                info: false,
                destroy: true
            });
            childTable
                .on('select', function (e, dt, type, indexes) {
                    if (type === 'row') {
                        var data = childTable.rows(indexes).data();
                        // do something with the ID of the selected items
                    }
                });
            tr.addClass('shown');
        } catch {

            var d = childTable.row($(this).closest('tr')).data();
            var parametros = JSON.parse(d[6]);
            $.each(parametros, function (index, value) {
                console.log(index, value);
                if (index == "Aprietes") {
                    nieceTable = '<table id = "niece_details" cellpadding="5" cellspacing="0" border="0" style="padding-left:50px;">' +
                        '<thead></thead><tbody>' +
                        '<tr><td>Apriete:</td>';
                    $.each(value, function () {
                        nieceTable += '<td>' + this.APRIETE + '</td>';

                    });
                    nieceTable += '</tr><tr><td>Par:</td>';
                    $.each(value, function () {
                        nieceTable += '<td>' + this.PAR + '</td>';
                    });
                    nieceTable += '</tr><tr><td>Angulo:</td>';
                    $.each(value, function () {
                        nieceTable += '<td>' + this.ANGULO + '</td>';
                    });
                    nieceTable += '</tr></tbody></table>';
                } else {
                    nieceTable = '<table id = "niece_details" cellpadding="5" cellspacing="0" border="0" style="padding-left:50px;">' +
                        '<thead><tr><th>Nombre</th><th>Valor</th></tr></thead><tbody>' +
                        '<tr><td>' + this.Title + '</td>' +
                        '<td> ' + this.Value + '</td>' +
                        '</tr></tbody></table>';
                }
            });

            childTable.row($(this).closest('tr')).child(nieceTable).show();

            var nieceTable = $('#niece_details').DataTable({
                searching: false,
                paging: false,
                info: false,
                destroy: true,
                scrollY: '50px',
                select: true,
            });
            nieceTable
                .on('select', function (e, dt, type, indexes) {
                    if (type === 'row') {
                        var data = childTable.rows(indexes).data();
                        // do something with the ID of the selected items
                    }
                });
            tr.addClass('shown');
        }
    }
});

With this configuration, the export buttons are correctly shown to me, but when I press it, only the parent table is exported. I am using Html5 buttons To export I am using this library .

I have tried to get the child table through the action of the buttons with this but without success.

I can't do the same thing as the child table (add the fields hidden), I haven't been able to do it better.

How can I get the table and its respective subtables to be exported?