Proton Groups (https://proton.me/support/groups) should be integrated with Proton Drive, and allow for the creation of shared sub-drive or folders.

That is, if I have a group "Team" with several members, that Team should be able to have access to a common drive (with an allocated space from the organisation, not taped into individuals space). This would simplify access to said sub-drive while Team x is evolving.

This is a functionality that currently exists in Google Workspace, and should be available for Proton Business too.