This tool uses Geometry Nodes to transform a curve into a Stitch Line. It's very simple to use;
you just need to append the "stitch.blend" to your scene,
select the "stitch" inside the "NodeTree" folder,
add a Geometry Node to a curve,
load the Stitch on the Geometry Node,
select a surface,
enter in edit mode with the curve selected,
delete the unwanted geometry,
set the depth to "Surface"
and start drawning.