[Resolved] Img credit in Page Hero?

HI,
I want to be able to give a photo credit to the Featured Image on my news site. How would I call the field name in the Single Post Page Hero for that?
I can see the fields for the post meta. Is there a comparable field name for the image’s caption? That’s where I’ve been storing the photo credits.
The caption shows appropriately when the photo is added in-line. But I can’t quite get the field name. I feel like if I had that field name I could just add it to the Page Hero fields like the post meta.

{{post_author}} | {{post_date}} | {{post_terms.category}} | {{img.caption}}

I even loaded up the Advanced Custom Field plugin, which is very nice and I was able to create a new field in my Media Library, but I couldn’t get that Custom Field the show in my page hero. 🙁

Thanks for any guidance. I keep thinking I’m rocking this and then come up with new ideas that are always beyond my skills.