And Chromium appears effectively as one of the possible watches:
but I couldn't make this work as I don't know the path to chromium on the app as packaged in Cloudron.

Could it be that this was not mentioned yet and not implemented yet as part of Cloudron package? Or am I missing something?
I don't see any mention of Chromium in the packaging: https://git.cloudron.io/packages/uptime-kuma-app/-/blob/master/Dockerfile?ref_type=heads
And at runtime, when trying to configure Chromium in Uptime Kuma, the app complains the path to chromium is not found,
In the settings, trying to configure a path shows this if no valid path is given, I guess no default chromium instance is setup, but I might be wrong.

This could potentially be delivered as part of the package, as done for Changedetection maybe? https://git.cloudron.io/packages/changedetection-app/-/blob/master/Dockerfile?ref_type=heads

What do you think?
Thanks in advance for the great and hard work