The best way to ask for adding devices is to ask in the relevant thread, to make a request on GitHub (if possible) or ask the app developer.
It seems that EcoDim E.V. has taken over the app from @TedTolboom and the relevant Homey thread seems to be no longer active, but that’s just a guess.
So my suggestion is to ask EcoDim B.V. itself via mail. I guess they are not active in the Homey forum.
