How to append text to file name when exporting image from lightroom classic

I've created some export user presets in lightroom classic so I can have a consistent export of images for specfic situations.  I'd like to keep the original file name, but append text to the front of it, so when I'm looking at these files in the finder, I can easily identify which user preset had created that export file. 

I can't figure out how to do that.  I can see how to completely rename the file, but to append text to the front of the existing file name is my goal.

Anybody know how to do that?