How to do gouraud shading?

[NightshadeGS]

I have been trying to figure out how to make a gouraud shading material node setup to mimic an older look in my game. I am not talking about regular vertex shading, I specifically mean gouraud. I read in an old post back from 2015 where a guy by the username “CaptainScience” had mentioned this:

You can do calculate simple Lambertian reflectance by taking the dot product of the light direction and the surface normal for every vertex, and then you use Gouraud shading to interpolate across the entire polygon (by plugging the light intensity into a custom UV).

I am not quite sure how to do this in 4.24, or really any version of unreal for that matter. I am still pretty new to this, so excuse me if I don’t quite understand some of the terminology, or node names. You may have to give a screenshot of the node graph as you explain it.