at this point, i have more notes for lsp than code but that should change by next week 😅
as for supporting rst, i envision a future where you can choose the markup language to use with dendron, either on a vault basis, via the frontmatter, or through a file extension. the lsp would interpret the file accordingly. i personally have a soft spot for asciidoc!
that being said, this would be a pretty major change and not one that i could commit to personally this year (though I can give pointers if others want to take it on 🙂 )