Google Takeout. Importing from takeout metadata is supported (at least edits to the images; not albums right now)

I tried using Takeout but the exported file structure and various metadata files were almost incomprehensible. This is likely partly my fault because I didn't download the full 100+ zip files, but I suspect there would be so many files scattered in too many directories to be much use.

I found this in an HN comment https://metadatafixer.com/ I haven't used it but it looks pretty promising

Yeah this was what my concern was basically