KanjiVG is maintained in a git repository at https://github.com/Gnurou/kanjivg. It would be great if the import function could handle the data in the repo directly, not only the release files.
Can't we just call the script that they use to make a release?
Yes, but the source format should actually be as easy to work with as the release. Also, this is more of a "nice to have" and not an actual requirement.