Measuring voltage after regulator

I’m using tegrastats to measure the CPU power and voltage, but the voltage is always shown to be around 19V, because tegrastats measures rails before the regulator that feeds to the CPU. Is there any way to measure the voltage after is has passed the regulator? Thanks!

It’s the same with below topic? I think it’s could be not possible from the software point of view. However I will check it and reply it after confirm it.

Dup with below topic.