OpenVPN interface in firewall rules

Hi!

I want to define a firewall rule with “In. interface” ovpn. Is there something like a wildcard i can use for all openvpn users like <ovpn-*> which i could define in the firewall? I tested with but after the openvpn session is closed the firewall rule is getting invalid and even after the ovpn is active again the master port is set as default in the rule.

Thanks in advance.

Reiner