Fill the stroke with a color gradient based on the stroke animation direction

[myarcana]

I would like the fill color of a stroke to be a gradient that processes in the same direction the stroke animation would (the stroke's writing direction).

How can this be done? Are graphics.txt's medians enough information for that (I don't quite understand what medians are based on the README)?

[myarcana]

medians seem to be the "turning points" of strokes, and describe the direction the stroke was drawn in. Here are the medians plotted on a character:

Drawing a gradient based on the medians using SVG features alone should be possible