Live Content scan mode does not seem to work, page value will be empty both on first load of the page, and both when changing the innerText of the element in the console manually. Otherwise the documentation is a bit crude (especially on the scan modes, how do they work), but if the value is available right on page load, it'll work.
it would be nice if there would be error logging (code 600 is not shown in most of the times when the scanner does not work), and also if I could write custom JS code to be executed after page load but before scanning for the values.