I happily paid money for Typora, which does roughly the same thing for just Markdown without support for JSON, Yaml (that I know of). This feels like a ripe space, especially with LLMs eagerly outputting reams of parseable text with embedded diagrams.
Thanks! Typora is great - Ferrite aims for similar polish but with native Mermaid, structured data support (JSON/YAML/TOML tree viewer), and the pipeline feature for shell integration. And it's open source!
+1 happy user of Typora. I really like its ability to auto-create a related assets folder for embedded media as it’s dragged into a doc.
The $15 price tag for Typora seems a bit steep considering the fundamental features it provides.