The problem with The Feast chat, let's solve the problem from the roots.

[ChocoFeru]

or like the OP is asking for which is a unrated 4v4 option but with chat since even in the PvP stats windows the unrated matches are classed as training

Yeah (I'm the OP!) we need an unrated 4v4 so people can train, even veterans. That will help new players to understand how it works, and maybe The Feast will be more famous and get new players if people feels motivated to try rated!