There's no easy way to do that. The only things I found for this are:
1 - Make a custom font with the glow effect and import it into Unity. You can setup custom fonts based on an image with all the characters (it's what Unity does when you import a new font, but you have to do the same manually). Or...
2 - Write a shader that adds the effect to the text. Or...
3 - Write some script that draws the effect at runtime in an image file and put that image behind the text. Or...
4 - Just make some images of the texts you want with the glow effect already on them, and use images instead of text.
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