Insert metadata field values in text layers using metacommands

Early versions of Photoshop did not have direct manipulation of text. You typed text into a dialog box and it was added to the document. A script could do that and make substitutions, or could be run on a layer once entered. I do something similar in my PDFExport script for Bridge.

Photoshop doesn't have this feature.

EDIT: Sorry, I missed the "idea" feature request tag! I have added my vote.

In the meantime, this will either require scripting or Photoshop Variables from a CSV containing the metadata:

https://helpx.adobe.com/au/photoshop/using/creating-data-driven-graphics.html

https://prepression.blogspot.com/2016/08/extracting-metadata-to-csv.html