How to assign an IAM policy to a lambda - typescript

I have a lambda that calls putItem to insert a record into a DynamoDB database table.

I get the following access error when executing it:

AccessDeniedException: User: **** is not authorized to perform: dynamodb:PutItem on resource: arn:aws:dynamodb:***:table/*** because no identity-based policy allows the dynamodb:PutItem action

I need to assign a policy to my lambda, exactly one that can perform the putItem function in DynamoBD. I do not know how to do it.

This is my lambda code:

export class NewPlatformIoTCoreStack extends cdk.Stack {
    constructor(scope: Construct, id: string, props?: cdk.StackProps) {
      super(scope, id, props);

      // Rule of IoT Core for MQTT sending of the devices
      
      const constructProps: IotToLambdaProps = {
        lambdaFunctionProps: {
          code: lambda.Code.fromAsset(path.join(__dirname, '../lambdasCode/mqttBroker/')),
          runtime: lambda.Runtime.NODEJS_16_X,
          handler: 'index.handler'
        },
        iotTopicRuleProps: {
          topicRulePayload: {
            ruleDisabled: false,
            description: "Processing of MQTT messages from AWS IoT Stack",
            sql: "SELECT *, topic(4) as device_id FROM 'v1/data/1'",
            actions: []
          }
        }
      };
     
    new IotToLambda(this, 'iot-lambda-integration', constructProps);
      
  };  
}