Nest thermostat pellet stove integration

Hi All

Fairly new to Home Assistant i have a pellet stove that i have turning on and off at set temperatures taken from current room temps measure from nest thermostat. My question
is how can i have the pellet stove turn on from the nest thermostats target temperature + 2 degrees so the regular gas pack doesn’t come on unless pellet stove can’t keep up.

thanks
chris