This is the right place for asking for an app request.
But because Athom itself is the developer of the app for Danfoss Z-Wave devices, you can also ask Athom. Maybe they are developing already an app for Danfoss Zigbee devices.
Another solution should be to use the ConBee II USB-Stick from Dresden Elektronik e.g. with a RaspberryPi and use the Homey deCONZ app. But it seems that the deCONZ app supports thermostats only as a generic device, what means without additional features. So please inform yourself what is possible and what is impossible with ConBee II USB-Stick and the Homey deCONZ app.
