How to establish connection between Unity and AWS DynamoDB for WebGL platform ?

Hello, I'm trying to establish a connection between DynamoDB and Unity to do CRUD operation on a WebGL platform using AWS mobile SDK for unity. In editor mode we are able to do read and write operation but if we take WebGL build and run it in browser there AWS is not talking with Unity. I tried by creating Lambda function to have a gateway for Unity and AWS DynamoDB to establish connection, but still couldn't achieve it.

Please guide me on how I can fix it and over come this hurdle.

Thank you, Lakshman