ADT smoke/heat sensor with retrofit alarm kit

Hello, I am in the middle of hooking up my old ADT sensors to ring with the retrofit kit. I've done all the windows/doors/motion sensors. The only thing I haven't done is the smoke/heat sensor (in zone 5 of attached digram). Ring says it doesn't support smoke detectors, however I have a seperate smoke/heat sensor that is just wired into the ADT box (not connected to the interlinked smoke detector system throughout the house). The smoke/heat sensors are wired in and connected with a 2-wire loop just like a motion sensor (with power). Can I hook this up to the retrofit panel as long as there is space? See attached images. I tend to think this should be fine since it looks just like a door/window sensor at the panel with the same max OHMS as the other contacts. Any thoughts on this?