Unfortunately no responses so far… nevertheless I continued my search and found that the TKH190B controller has to be put into a Coviva smart hub for which there is no binding in Openhab to my knowledge.
So this is a dead end for me.
I also looked at iDiamant with Netatmo that can be controlled from Legrands home + control app. Although Legrand provides an API for developers, there is no openhab binding (yet).
Is anyone working on this perhaps?
Alternatively I found an RF micromodule for Bubendorff shutters [229018] that can be combined with a Fibaro FGS-222 to move the shutters up and down. Although this does not support scenes or in between positions, I think it is the only option that may work as it connects to openhab via the zwave binding.