Disable New User Creation

Hello,
I have some local access Admin users, for member of my house that need to create automation, but I don’t want them accessing from outside the local network. but as they are admins, they could change their access permission anytime to have access from anywhere or create a new user with all the privileges. There is a way to disable that permission?

If the user is an admin obviously he can do anything he wants on the system. For now in HA there aren’t enough role-based permissions.