[tpoacher]

Or you could do what I do, and write the report as specially marked comments in the actual code, which can be grepped out later to create a valid markdown document.

Pipe into pandoc, prepend some css, optionally a mathjax header, done. Beautiful reports.

Honestly I've yet to be convinced there's good reason for anything more than this.

[enriquto]

Yes, I use a very similar setup with a three-line makefile to test and build. But the OP wanted to use the in-browser notebook interface, and this is srill possible via jupytext (while allowing collaboration with out-of-browser users).