Works (but is a bit clunky and needs UI/UX work).
Other reviews say sub menu only has 'help' option but [in the add-ons menu] if you click on word 'Show' it displays (hidden?) menu where you can reveal hidden / formatting characters.
Also, it does not auto refresh - when you make formatting changes you have to run the query again to show the new formatting characters. it does not display changes 'on the fly' like MS Word. This is a problem for large docs as it took 2 mins to recheck my 100,000 word thesis each time...
It did what I needed IE shows hidden characters that are controlling my doc.