It’s something a lot of customers have asked for. I’m sure it will come in a future release but unfortunately I can’t say when. The new export options were a step in the right direction and watermarking would be another improvement, especially with the ability to use graphics and logos.
I am really wondering why Adobe brought it first to the mobile apps and not to desktop version. Also I would expect that this feature does not need to be re-invented and is pretty critical for many photgraphers.