Firewall alias for UPNP forwarded ports [net/upnp -- UPnP IGD & PCP/NAT-PMP Service]

[Caligo82]

Is your feature request related to a problem? Please describe.
I want to protect my UPNP forwarded ports with additional firewall rules

Describe the solution you'd like
Ideally I'd like to have UPNP plugin create a firewall alias for its forwarded ports. Also per client separation.

Describe alternatives you've considered
I set up a script that can read UPNP ports and saves them to a txt file.
I set up a little http server using nginx serving these text files containing the corresponding ports for each client.
Tried to set up a port alias similar to maltrails fail2ban blacklist.
However trying to set up an alias it complains:

Entry "http://127.0.0.1:9080/upnp.alias/UPNP_178_PORTS.txt" is not a valid port number.

Obviously OPNSENSE only wants raw numbers there...

(If there's a workaround by manually setting an alias... that'd be possible too...)

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