HI @Anonymous
I'm guessing you're talking about Exchange (or AD, or something similar) distribution lists right?
You're right, there's no connector to achieve that. You're right again that Office 265 Groups would help you in this regard.

Sorry that I can't help you further.
If I have answered your question, please mark your post as Solved.
If you like my response, please give it a Thumbs Up.
Cheers
Manuel