@celia Let me know if you manage to find anything.
@celia I did migrate my Google Photos library back in March. I basically only needed the files, so I've written a Python script to help me retain all metadata
https://codeberg.org/kytta/metadater
Steps:
1. Create a Google Takeout (https://takeout.google.com/) with your Google Photos
2. Run the script on the directory
3. You get a new directory with the photos properly tagged using EXIF and atime/mtime
I hope this can help you :) I'm happy to assist you further if you decide to try this out.
I'd like to close my Google One storage plan after-wards.