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, radio-browser.info, 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

Renne

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