The md-to-html demo is a good one, but worth mentioning that the Markdown parser[1] being used may not be suitable for more complex documents. From the README:
"...it is not recommended to use this parser where correctness is important. The main goal for this parser is to provide syntactical information for syntax highlighting..."
There's also a separate block-level and inline parser, not sure how `tbsp` handles nested or multi-stage parsing.
[1] https://github.com/tree-sitter-grammars/tree-sitter-markdown