Hi, not OP, but: that’s known as frontmatter, it’s somewhat widespread, and thus I suspect that it’s much more difficult to have it live at the end of your markdown files than in a separate file or db altogether - unless OP is already rolling their own markdown parser.

Syntax highlighting for code blocks is the reason I prefer discord over slack for collaborating and just chatting with friends who know how to code. I imagine some irc clients exist that so the same, but at least with discord I know my recipient is guaranteed to see what I see.