Set VPN expiration by date

Hello, this project is really great. Wish you would be able to add a feature to allow VPN expiration by date. I have seen that there is a VPN session reauthentication which the user signin to their acxount and it will reauthenticate vpn session. It would be a greate feature to have a VPN expiration set so it will expire on specified date and user will not be able to connect to VpN even when they reauthenticate unless expiration is set or updated to furture date. Thanks.