That's basically what I'm trying to build - we're starting with Quill.js and ShareDB, adding extensions, configuring, and then adding a plugin system based on React, which can take arbitrary components all based on ShareDB sync (think spreadsheets, forms, but I'd also love to integrate the Pyiodide stuff to have runnable Python code inside a rich text document, etc). We built this as part of a synchronous collaborative learning platform, but I'm currently trying to extract the key components so that it can be a stand-alone open source library that others can help build on. Very early prototype: https://www.npmjs.com/package/@chilifrog/reactive-rich-text
