Repeat group inside repeat group used api

Hey guys! All good?

I would like to ask for help with a routine I’m trying to set up:

I have an alpha RG with their respective fields listed (via api). It works.

I now need to insert another RG (let’s call it beta) inside RF alpha to list another group of fields. The fields are the same as those returned by the RG alpha api.

In the ways I tried, the RG beta fields or list all the items I need, separated by commas, so many times the amount of RG alpha items, or nothing appears.

What is the best process to include an RG within another RG?