maybe some info for reading.
there are smart 
people who made macro’s that used a bed sensor and a top sensor to calculate heat soak time
github: klipper-voron2.4-config/heatsoak.cfg at mainline · garethky/klipper-voron2.4-config · GitHub
topic post for info : Interruptible heat soak - #3 by elpeter
the github version uses a extra sensor for calculating heatsoak
edit: after inspecting the topic i saw you also commented in there, little bit of old news then 