I'm not OP but I have only a basic knowledge of Haskell, and after giving it my best effort, I wrote my own parser rather than modifying Pandoc. If Pandoc didn'

I'm not OP but I have only a basic knowledge of Haskell, and after giving it my best effort, I wrote my own parser rather than modifying Pandoc. If Pandoc didn't sell me (user of many languages over many years, a true believer in functional programming, and someone that writes solo projects for personal use) on Haskell, I don't think it can be done. The Pandoc source is literally just a big blob of uncommented gibberish to someone that's not already a dedicated Haskell programmer.