[ims]

As far as storing a human readable version for code reviews and diffs, we use nbautoexport for this - https://nbautoexport.drivendata.org/ - which automatically exports plain text source files.

(Disclaimer: this tool was written and maintained by colleagues of mine.)

[KMag]

This tool looks cool. Unfortunately, it looks like this tool in export-only. Ideally, one wants a single source of truth, and if your reviewed artifacts can't be imported for execution, then your code review can't be reviewing your source of truth. Don't get me wrong: it's much better than reviewing JSON diffs, but in highly regulated/conservative industries, we'd prefer to be reviewing the actual code that gets compiled/interpreted.