Make custom tags usable in an arbitrary chat
We have many discussions accomplished via ad-hoc chats rather than fully-fledged channels. However, even some of these chats grow big enough that it would be convenient to quickly tag a subset of the members.
One of our channels has a tag for the subset I am thinking of, but I cannot use that in the chat.
I see how this isn't an easy question, but could there be some way to make custom tags usable in a chat?
Note the contrast with the currently existing functionality, where you can start a chat with all the members of an existing tag. I'm talking about being able to use a convenient tag in a chat with arbitrary members --- maybe it can even be intelligent and if only a subset of the members of the tag are present in the chat, only those members get pinged. : )