/team inventory and /team chat
/team inventory, when u open team inventory u can put any item so your team can get it,
/team chat, so u can talk with your team so enemy can not know it like u want to tell your streategy so only ur team know it.
/team inventory not for solos
/team chat not for solos and mega
Team chat could only be for >2 players because of Microsoft rules, but still this would be a great feature
If you are in a party of 3 or more people you can run the command /pc and get a team chat that way. The team inventory is also already a thing in treasure wars as the ender chest.
A party, yes. But not a team with which you are not in a party. Imagine you’re queueing TW trios: you can communicate and coordinate your actions so each person works together in a better way.
Oh yeah… tbh I kinda forgot about normal queuing lol. Tw mega already has this, and I think the only reason the main game doesn’t is bc of Microsoft’s rules.
Like your other post, a command would not work out well for team inventory, due to controller players not being able to type fast. Plus enderchests are a team inventory, like said above.
If you wish to see team chat vote for it here!
Team-chests are already designed in the form of enderchests.
Teamchat has already been suggested multiple times, if you would like to see it added please click the link below and vote from there! 
/tc for team chat - Suggestions - The Hive Forums (playhive.com)