Anyone here knows inkscape CLI? I wanna convert a svg to pdf. I have 550px x 850 px but I want that to be milimeters. My command print bigger than it should.

inkscape.exe --export-area-drawing --export-filename=out.pdf --export-width=850 --export-height=550 '.\Input.svg'

Also (or alternatively) I would like to know how can I tell my pdf dimensions
I ended up using svglib, Mistral was the only chatbot that gave me correct code, might upload to gihub later