If you view your Shared Album photos an Apple device, there is no way to get to to the metadata.
However, the metadata are still there. I learned this after I installed the "iCloud Shared Albums" app on my Windows computer.
When you do that the app will generate a directory for the shared photos and (after a few minutes) your shared photos will be downloaded there. Just open a photo with the regular photo viewer (I use Photos in Windows 11) and click on the circled "i" on the top line. The data will pop up.
I am not sure if this is relevant, but read on if you do not see the data. When you create the shared album, there is no way to select if you want to keep the metadata. In my case, before I started creating my shared albums, I first shared a single photo. (Just click on the "up arrow in the square box" when you view the photo. ) In that case you will have an opportunity to specify what do you wan to keep. Perhaps those settings are transferred to shared albums, but I am not sure.
Good luck.