For the mean time while there is no app available, maybe you can try to make it smart another way… I’m using a mi box in my bedroom wich is also running android tv. With a smart plug, when I enable the plug, the box is turning on, and disable it by disabling the plug.
But because it’s running android TV and has a Chromecast built in, you can do a lot more in combination with the Chromecast app for homey. Start a YouTube video or install kodi wich has also an app for Homey. This way you can do a lot allready I think.
I can power off the projector with this HTTP command: http://IP:6095/controller?action=keyevent&keycode=power
The first time the command is ran from a peripheral, the projector asks for permission to allow the peripheral orders. I guess it’s based on the peripheral IP.