The thread’s 1st posting might have the workflow for creating the personal CSV and JSON files.
If you set those 2 files as Media “objects” (and set your OS to open .csv and .json files in a text editor), will revisions to those files recognize immediately? (That is unlikely, as there is no “signal” for an updated file in the file system.) Or, upon the next active object change? Or, do you have to reload the gramplet (or Gramps) to refresh the Gramplet?