I assume that the “Dynamo” you mean is “AWS DynamoDB”, not “Dynamo”.
As far as I know, in this forum nobody has ever reported he/she managed to let a Test Case script in Katalon Studio to talk to AWS DynamoDB.
I have ever challenged to let a Test Case script use AWS SDK to communicate with AWS S3. The challenge I needed to resolve was how to resolve the external dependencies (required jar files). I could mange it. See the following post for what I have done. I guess you can do the same way for DynamoDB — you can download the external dependencies for DynamoDB to make them available to your Test Cases.
It requires a lot of technical efforts to let Katalon Test Case to work with AWS services. Katalon Studio provides no support to do this out of box. So, I think that you should review how much you are demanding the connectivity to AWS via AWS SDK. Don’t you have any easier option?