First you need to turn the text into a shape; GF doesn’t recognize text. @Jules shows how to do that in this tutorial: Make a Name Pendant in Inkscape
Then you need to subtract the text from the shape behind it so the GF only engraves where the text isn’t. There’s another tutorial from @Jules that includes subtracting a shape from another: Glowforge Interface - Vector Files Made Easy 🤔
If you work through both of those you’ll be well on your way to making it happen. 