adding a exception rule to do not disturb?
The only exceptions to Do Not Disturb are calls or texts from individual contacts that you have marked with Emergency Bypass. (Edit a contact, tap on Ringtone or Text tone, then enable Emergency Bypass at the top of the screen. You have to do this for each of calls [ringtone] and texts [text tone] if you want both to get through.)

You cannot add exceptions for any other kind of notifications or activities.