High voltage, high current variable
https://electronicbase.net/low-pass-filter-calculator/

10mH and 4.7mF give 93Hz cutoff frequency.

Assuming your PWM is at 930Hz. Power falls as 20dB (x100) per decade (x10 frequency). Your filter is just 1 decade below working frequency in this example. So AC power that remains is 20dB lower, or 1% left. It is likely okay.

https://en.m.wikipedia.org/wiki/Cutoff_frequency

Practicality: 10mH 100A is a welder transformer. 10kg.

TLDR: For each x10 frequency difference, AC power drops by x100.