I think the closest system to typst is Overleaf (I hope they put in their website comparison menu), but the killer feature is that Typst apparently can support local-first that Overleaf does not, and it's wonderful feature for those who are writing a lot even when camping in remote areas (ok I'm stretching a bit there).
Since the Typst's document compiler is open source then it feasible to integrate it with Docusaurus and Tinasaurus (based on TinaCMS). But again there is also Pretext that is open source that can be used as document compiler alternative to Typst [2].
[1]Typst, a new markup-based typesetting system, is now open source:
https://news.ycombinator.com/item?id=35250210
[2] PreTeXt: Write Once, Read Anywhere:
https://pretextbook.org/index.html
[3] PreTeXt: Write Once Read Anywhere Authoring and Publishing System: