Host port not being forwarded, only exposed port

[deviationist]

Not sure if this is intentional, but I'm not able to add a rule for my OpenVPN-server.

In my case I'm trying to set up OpenVPN with Docker, this is working fine with vanilla Ubuntu 22.04.2 LTS.
Here is the build command: docker run --restart=unless-stopped --name=openvpn-server -v ~/docker-config/openvpn:/etc/openvpn -d -p 1196:1194/udp --cap-add=NET_ADMIN kylemanna/openvpn

As you can see the container exposes port 1194 and I've mapped it to port 1196.

I've installed the ufw-docker-script as instructed in the README-file, UFW is activated, then I run sudo ufw-docker allow openvpn-server 1196/udp to add a new rule in iptables, but I get the following error:
Fail to add rule(s), cannot find the published port 1196/udp of instance "openvpn-server" or cannot update outdated rule(s)..

Is this intentional?

[deviationist]

If there is only support to open port for the exposed port (and not the mapped port) then it would be nice with some sort of solution where one do a port forward in the iptables. So that I can route my VPN traffic to my Ubuntu-box on port 1196, then iptables routes it from 1196 to 1194 on the Docker-container.