Yunohost-firewall: How to accept ports created dynamically by UPNP/AV-server?

My YunoHost server

Hardware: Proxmox (x86_64) with Yunohost VM (KVM + qemu)
YunoHost version: 11.1.9
I have access to my server : Through SSH | through the webadmin | direct access via keyboard / screen
Are you in a special context or did you perform some particular tweaking on your YunoHost instance ? : yes
If yes, please explain: upmpdcli installed via apt

Description of my issue

upmpdcli is an UPNP/AV server (local files, Deezer, HighresAudio, Qobuz,, Spotify, Songcast, Tidal).
upmpdcli opens ports dynamically to serve audio streams to UPNP renderers.

How can we configure the firewall to allow dynamically opened ports in a LAN?

Thanx for any hint


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