OK, I know we're getting in the weeds here but sure: Go into any of the example's you downloaded for UE4, find any of the text that they got floating behind the examples and click on it. These blocks of text are actually generated in blueprints. One of the exposed variables in the text actor is a string, you can type any…
So, once you have the font material expression generating the single channel output (as you can see with the red channel in the image) you can do anything with it. You've got the text there, you can color it (for example with vertex color), use it as the alpha channel for your decal, generate a normal using the…