Chat idea for premades

People are complaining about in game chat that premades are constantly chatting and making them pissed and sissy, why Riot ain't adding like separate in game chat for premade, for example there is /all /p so add /g (premade group) chat, so u write /g u switch to group chat but u can still see all the chat of your non premade teammate and so on. Although this premade chat is not visible in report case.

More thoughts about this?