Is your feature request related to a problem? Please describe.

I think this subelement doesn't exist for Textures too, and I'm guessing this was because most textures people pick won't be rectangular, making the glows look bad. However they could still be quite useful, and it may as well be on the user to decide what looks good anyway.

Specifically though, I often use a Progress Texture to "fake" and Icon. Giving it an Icon texture for a background, opening up options for the progress to be radial or linear. This almost works but minor things like the lack of a Glow can make it awkward to do well.

Describe the solution you'd like

Add the Glow Subelement

Describe alternatives you've considered

External Glow to self is pretty rough.