What do you mean by parser? Office docs are just zipped XML files. They are trivial to parse. The hard part is all the quirks the document renderers have, which makes it impossible to perfectly match the output. But markdown can’t handle any complex formatting anyway
I think you may mean https://en.m.wikipedia.org/wiki/Duffless . Saw that one recently. If so, then https://simpsons.fandom.com/wiki/Duffless/References has the picture you are looking for