After some experimenting and using existing xml files as templates and combining them with generated xml file, I have my two (new) devices as known devices in my things list.
Used docker cp to update/replace the jar in my local docker container, and after a container restart, they showed up.
Copy the jar to your local file system
docker cp openhab:/openhab/userdata/tmp/mvn/org/openhab/addons/bundles/org.openhab.binding.zwave/4.3.0.M4/. .
and update/add your xml files in the jar file (effectively a zip file) to the existing (archive/zip) folder(s)
OH-INF\thing\[manufacturer]\ for my Shelly devices OH-INF\thing\shelly\.
docker cp ./org.openhab.binding.zwave-4.3.0.M4.jar openhab:/openhab/userdata/tmp/mvn/org/openhab/addons/bundles/org.openhab.binding.zwave/4.3.0.M4/
Note: a (docker) container image update/re-pull will of course ‘revert’ this manual change.