Leaving-Chat-group option if not using DC

Good team, developer, user,

coming from another “polite” praise topic here, and just having had an un-subscribe request for an no-dc user: would it be possible to allow a command like “unsubscribe” “leave” as text message to be used, so that one, not using DC, could leave a chat group by sending it back into the group? (DC-user have that possibility)

Or any other suitable way?

Of course a note in each email would be of need.

(As there is the new feature of broadcast: if in bbc-manner, possible likewise good if others are able to “escape”. Dc-user might be not aware of being broadcasted, though.)

That would be than possible more polite then MUA-user could usually offer.

Not sure if worthy a feature.