CX Sales Mobile - How to accessing custom fields via query('resources') and making REST requests

I’m developing a script in Oracle Sales Cloud Mobile and have two questions related to data retrieval:

Custom Fields via query('resources'):
I’m using the command const resourceQuery = query('resources'); to fetch user information, but the response only returns standard fields. The custom fields (added via App Composer) are not included.
Is there a way to include or access these custom fields using the query() function within the Mobile app context?

REST Requests in Mobile:
I’ve tried to make REST API calls from the Mobile app using plain JavaScript approaches such as fetch with Promises, as well as the