Ability to edit info after custom http post request handler returns.

[CLFrod]

In my understanding the current function of the dash-uploader when using a custom httppostrequesthandler is that you
return the filename, and then the filename gets displayed in the upload box.
Is there anyway to be able to edit what is displayed upon upload?
For ex. if my filename is upload.zip, I want to be able to catch that, and add extra text to it before it gets displayed as
"Uploaded! upload.zip"

I ask this because I want to send extra info through my custom request handler. Instead of only the filename.