NOTE: For Blender 2.9+ You need to ENABLE Ambient Occlusion in the EEVEE Render settings for this to work. Also, this will not work if you have Transparent checked in the Film render settings.. Neither of these are necessary in CHALK STYLE PRO.
https://gumroad.com/l/chalkstylepro
CHALK STYLE Render is a Blender 2.82+ addon which provides a workflow to quickly create Ambient Occlusion (AO) βchalkβ and βsketchβ type renderings. (Note: CHALK STYLE does not work on versions < 2.82)
The workflow is straightforward.