Very cool, I'm building something similar (with a larger scope) [0] (it also has one-file exports, but it does load stuff from a CDN so it's not as contained to a single file as this project is.)
If you're looking for next steps: You can actually run user code using `import`, which will allow your users to import code from external websites using familiar `import {x} from "https://some-url.com/bla.js"` syntax at the top of cells. Here's how:
I have experimented with async/await with js+help.html.
The import pointer is very interesting, thank you for that.
My impulse is to try to write a function to import a code from a URI.