Disable private chat with the coach

As a coach, I want to be able to configure the setting so that members cannot start new private conversations with their coach. For example, I want to offer my guidance via check-ups and group chats, without providing additional one-on-one chat support. Simply muting chat notifications is not sufficient for this. The setting must restrict the initiation of private conversations, while allowing communication via check-ups and group chats to remain usable.