A list of authors is already collected by Zenodo (and probably all the other platforms like it) when you submit something to it.
Metadata and making it machine readable is important however we already have solutions to this for PDFs, Word files, images, etc which people regularly submit. Which suggests we can keep using that system.
The exception would be if there are specific new fields or kinds of metadata which are not collected already for the many other types of files people submit. I can’t think of anything unique to notebooks (or a directory of files one of which is a notebook as I think the shareable unit is a directory not a notebook).