/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 too…
Idk about this working in duos cause 1 on 1 chat which Hive and Microsoft prohibits but this could work in trios and squads.
As stated above, team chat is not something Microsoft would allow for duos. As for team inventories, I feel like ender chests already suit this purpose, and anything more portable might be too over powered.
On top of what they both said, a command for something like that is awful. Rip controller players
Teamchat is a great idea tho, vote for that here