Gimp 2.10 / linux: How to export PDF with searchable text.

[lawlist]

I'm using Gimp 2.10 on Linux (Ubuntu 20.04 LTS).  I import a multi-page PDF with searchable text into Gimp as layers.  I add a signature JPG file to one or more of the pages and then Export as a FILE.PDF.  The resulting PDF is not text searchable; e.g., I cannot select a sentence in the exported PDF with the mouse and then copy it to the clipboard.  Is it possible to Export to PDF and have the resulting PDF searchable with text?