Honeywell Home RTH9600WF Smart Color Thermostat

More or less the same answer like here.

But because I’m not familiar with Honeywell and but there are already 2 apps for Honeywell devices available, you can ask Athom and/or Resideo Technologies, Inc. if they can add your thermostats.
If this isn’t possible, then you would have to make an official request for a new app.