Improve Pandoc's syntax highlighting output (Skylighting tokens and span styles are a bit too simplistic)

[badlydrawnrob]

TL;DR: Skylighting makes some themes impossible to recreate.
The tokeniser (I think that's the right term) is more simplistic than other highlighting tools, and possibly wrong in some areas.

I've searched for similar issues but there are a lot of syntax highlighting (closed) issues! I've made some observations here about how Pandoc is outputting it's syntax highlighting for Markdown fenced code blocks, as I've been running into some roadblocks when trying to create my own colour themes.

I understand you're using Haskell's Skylighting. I'm not a Haskell guy (I've seen a couple of workarounds but I'm not a good enough programmer to understand them!

• Are there any known issues of this sort, or future plans for improving the highlighting to get closer to Visual Studio Code's, highlight.js, or Pygments (for example) highlighting capabilities?
• Are there any simple ways to extend Skylighting that a novice programmer could achieve? (or choose a different highlighting tool for Pandoc to use)
  • Or at least advise if one of the fixes I've mentioned above are safe to implement.

Pandoc, in general, works just fine and is easy to use and compile for my purposes, but some languages (like Elm Lang) render quite poorly, for example, .fu is applied to both functions and it's arguments, so the Breeze Dark Theme is impossible to recreate: