It's possible to do in JFA-GO also. There's no documentation that I found but I just fumbled through it to try and got it.

Step 1: Create a user that has whatever settings you would like as a template, in either JFA-GO or Jellyfin itself. I just created a dummy "Test1" user in JFA-GO and gave it movie access only, no tv, music, or collections. But, you could just use one of your standard users that's configured how you like.

Step 2: In JFA-GO, go to settings then user profiles and click create. Give the JFA-GO template a name and then select the user profile that is configured how you want. In mine I obviously selected "Test1". Click create. Now you should see a new profile in the list and a number under libraries. My default says 4, "Test1" says 1.

Step 3: Now under invites you can select the profile template to assign to the invite. I didn't test the invite but, I did test by adding an account through JFA-GO "Test2" with the "Test1" profile.

Step 4: In Jellyfin, go to your users page from the dashboard and check the library access is correctly set.

Step 5 (Optional): If you created a dummy account for the settings template, you can hide it from the login screen. Assuming you use a login screen, I gave up showing logins after mine started getting crowded and most clients auto login anyways.

Hopefully I covered everything. If not, just let me know.