I'm too lazy to study how this lib is implemented, so I'll leave it as an issue here.
I've studied thoroughly one of monitoring tools, and I managed to pry from it how to measure power rails, e.g. how much power is consumed from PCI-E slot.
You might want to take a look at JustAMan/pynvraw@d98c7e0
I'm also going to look in the RTSS SDK - they seem to have better understanding of the structures, so I'm going to update my Python lib based on them.