@psriyanka For Table Row Expansion there is a separate JS file that AWS dashboard would be using. If you have not migrated the required JS that functionality might not work. Check Browser Console to see if there are any JS based Client side errors.
I checked for the json file, its using json file which is included in the code.
But the issue still exist, the other one of the dashboard is capable of pulling the data as in the splunk_app_aws, but the other dashboard is not showing up the data, not able to get to the cause of it.