That's a good point, especially
once we have a way to use more than 256 glyphs! Pretty useful piece of information I seem to have overlooked there... and no one else has mentioned it over the years
Part of the issue would be that there's not currently a convenient place to put it design-wise. Way down in the Info box wouldn't make sense, as that's for information about the canvas and image. Consistency-wise it should appear next to "Glyph" in the Apply window, but it's too tiny to fit anything. Anywhere I put it is going to ruin the design :/. Certainly I could just throw it somewhere, like into the bottom space of the Apply window, but ideally this will wait until the new UI is implemented so I can design space for it.
(If and when I do some other smaller releases before then, I can also try to fit in a temporary solution that isn't too terrible.)