Outline a spite niagara effect?

Can’t seam to figure out how to add an outline to a niagara sprite. So for example the sprite color being white with a black outline. I followed the below tutorial for floating damage numbers as a niagara effect and it works great, but need to improve the readability.

Would this need to be done in the material itself? I’ve looked at some tutorials and they’re all for overlay materials, which I can’t use here. So I’m not quite sure how to add an outline to it. Below is my current material.

Had no luck so just going to go without. The best I could get was to use a RGBA Render Target 2D and letting DrawText color it instead of the Niagara effect. This however is more expensive than using R8 and letting the Niagara effect color it. So just going to go without the bordering, which is fine as it’s just floating damage numbers anyway.