Indeed. I see "Heat Source Type" which allows selection of "Gas Boiler", "Oil Boiler", "Electric Boiler" or "Heat Pump". Under that is "Control Type" with the 3 choices above. Note the "Control Type" appears blank but you can occasionally tap it to select an option, it's rather temperamental.Sorry, I'm getting mixed up! It is called control type not relay type. So you can see all the options? They have been missing in the app for quite a while for me and others.
This is on 6.2.0 via android.