Question Can someone help me replicate this Reflex gun sight shader using shader graph?

I'm pretty useless at shaders, and I want to make some basic changes to the shader detailed in this blog post:
https://vazgriz.com/158/reflex-sight-shader-in-unity3d/

Can someone help me recreate this shader using shader graph (which I'm more confident with than coding shaders manually)?

Any help would be greatly appreciated