- Includes/embeds (reference your source code by line range(s)
- Complex table support + the ability to embed CSV (automatic headers)
- Frontmatter as a first class citizen
- Macros (Variables) that can be referenced across documents
- Numerous Diagram parsing libraries (embed pretty much any diagram-as-code language)
I've had the same thoughts on building a Dendron type extension for AsciiDoc (AsciiDoc vscode plugin is fairly robust). Really would just need to hammer out some front matter parsing to get basic functionality.