How do I add captions to photos in a shared album in Photos OS27 besides a one on one edit ?

I created a shared album of photos from a recent trip in Photos OS27. I know that any captions I type go into metadata that is NOT available to anyone I send a shared album to.

The original photos all have titles added via the Info panel for each photo.

Is there a 3d party way to add the captions without the tedious individual Edits that burn the title into the photo?

I keep hoping the Photos app will actually become easier to use with advances in the OS.