All project and library files produced by KiCad are text based.
You can edit a footprint in your prefered text editor and check the pads coordinates.
It should be relatively easy to understand what the values are, but you can also have a look on the documentation:
Sh "2" C 1500 1500 0 0 2700
Shape: shape Xsize Ysize Xdelta Ydelta Orientation