I have considered this feature but there are two issues. Firstly, as far as I know, there is not a single system API call that one could just use to get this information, instead, how to read this data varies on different hardware (which would mean a lot of work to support all possible hardware combinations).
Secondly, there are already a myriad of software that can display this information already, so I don't know whether it would make sense to add such feature.
The purpose of jv16 PowerTools have always been to do things that other software cannot do, or do that better. In regards of showing system temperatures, I don't know if there is anything there that I could do better.