I built myself a Serial Monitor app that integrates with the GNOME desktop. Learned a lot about how to build GTK4 apps and publish them as Flatpaks or Snaps.
Maybe it is also useful for someone else so I published it on Flathub: flathub.org/en/apps/art.taunoerik.tauno-monitor and Ubuntu Snap Store snapcraft.io/tauno-monitor
The source code is available on Github: github.com/taunoe/tauno-monitor
Tauno Erik 