[Suggestion] "In Lobby" Friend's List Notification

A patch or so ago, a feature was rolled out that would indicate when someone on your friend's list was creating a normal or custom game, and it's been really helpful (for me at least).

I was wondering if it'd be possible for the team the handles the UI to go a step further and display when someone is "In Lobby" as well, as this is much more prevalent. You could even make it as specific as "In Lobby of 3/5 or 2/3 (for TT)" or leave it to the general "In Lobby".

Often, I'll invite others to play only to find out that they're in another lobby already. It feel particularly nice to turn down someone else, I know. So it'd help to know ahead of time who's already playing with someone else as opposed to who's actually available to play. I know this doesn't cover every instance, but I think it'd be a nice addition.

Is this acceptable/doable, or too pervasive on player's privacy? I personally wouldn't mind other's seeing that I'm in a lobby already (I'd actually prefer that to disappointing them), but I know others might feel differently.