For a vector illustration project, I am looking for a way to extract the shadows of objects in Freestyle. Currently I am only able to export the object itself (with *Freestyle Edge Marks* and the *Freestyle SVG Export* add-on):

[![Left: monkey rendered in blender with a drop shadow. Right: the exported .svg only contains the object, and not the shadow][1]][1]

How can I reveal the contour of the shadow with Freestyle?

  [1]: https://i.sstatic.net/ZY2l6.jpg