This is a Vim plugin / Pandoc filter two-in-one. This allows rendering HTML and PDF documents with code blocks which look exactly as you see them in Vim or Neovim with your favourite colorscheme. I used this in my old blog: there is a link to it alongside with a couple of images at the bottom of the README.
Show HN: Highlight Code Blocks with Pandoc and Vim / Neovim and Treesitter | Heykuki News