how to set individual margins (left/right/top/bottom) with pandoc shell command when creating pdf?

I'm pleased to see pandoc can specify some latex (which I know almost nothing of) geometries to customize the margin size of a pdf it creates like so.... pandoc -V geometry:margin=.5in somefile.mkd --pdf-engine=xelatex -o output.pdf ...but is there a way to make the side margins different from top/bottom margins? Can each of the four (top/right/bottom/left) margin sizes be set individually? I've tried options like geometry:margin=.5in,2in and geometry:margin-side and geometry:margin-top but none of those work. From https://pandoc.org/MANUAL.html these margin-left, margin-right, margin-top, margin-bottom should be able to be set individually but I can't figure out how to use them as commandline arguments.