A workaround that at least gave me 50% access to my legrand system within homey was to link legrand to Alexa (legrand skill) and then import the light-switches into homey through the alexa-App. Still missing shutters and Temperature control though.
Unfortunately, Athom is not going to do this (are now a developer of the Netatmo app). So depends on whether there is a volunteer developer who wants to create this app!
We can vote just with a like ?
I can donate momey for a developper too, around 30$. I think if all interested people can make a little donation for a dev it could be attractive