There are times that I might want to make note of something in-game in team games (for example things I might want to keep an eye on for my next move) but not broadcast it to my team, if there was an additional tab in the game where I could take notes, or a port of the message “to self” function from 1v1 games I think that would be good.
You can already make notes to your team only. Thats all you need. For thew opposition to not see it.
This would be a waste of server space and coding time.