One way to skin this cat is to export from Lr as TIFF, then open Ps, and run File>Automate>Batch. You can then re-import to Lr while leaving them at their current location.
FWIW, I don't know why you'd want to send them back to Lr. What I would do is:
- Import the RAWs to Lr, cull, adjust, rate, etc.
- Export my chosen shots to TIFF
- Run any/all Ps processes needed on the shots and save final versions |