PROBLEM 1 - When maintaining applications that use many similar layouts of repeating groups to display similar data, it is extraordinarily time consuming to maintain those layouts.
PROBLEM 2 - When trying to combine results returned from 2 or more API’s into 1 repeating group, the options are limited (plugin or javascript hacks) and/or slow (ie-storing them in a table).
Here is an example of how AWS accomplishes this using JSON Path Expressions: https://docs.aws.amazon.com/apigateway/latest/developerguide/rest-api-data-transformations.html
Here is a bubble plugin that helps accomplish this using JSONata, but the learning curve is incredibly steep: https://bubble.io/plugin/jsonata-1586602313260x777560374814703600.