As far as I can tell, in the testing window you'd have to look for a
group and a user, and it will tell you if they are in the group. I think
this is expected behavior. - Or are you running into any other issues?
There is a DDM profile available for this. Jamf has announced that the
option to manage extensions will come with the release of "Blueprints".
You can read about the declaration here and watch the keynote
presentation about blueprints here. Hopefully...
