Hey maxdieri, thanks for joining the community! My apologies for the delay in reply.
Those sort of permissions aren't available per vault. It's an interesting idea though, and I can certainly see the benefit with the use case you described. I can't say if or when such permissions will be added, but I've shared your request with the team.
While it's not what you described, what I can currently suggest is setting the item sharing permissions at the account level, then adjusting which groups have share access to the different vaults that would be relevant to them.
Let us know if you have any questions, and thanks again!
48438160