[Feature Request] Simple way to make Cel Shading

I have been working on my game for about 6 months now and I want it too look good and play well on a wide range of computers, as well as making it last. I can think of no better way to do this than Cel Shading. If you look at “The Legend of Zelda: The Wind Waker” for example, a 15 year old game, as long as you bump up the resolution it still looks pretty good. My problem has been being able to implement it efficiently in my game. There ways to work around by using Post Process materials, however they come with many limitations, like not being able to use specular materials for instance. I don’t know how feasible this would be, but an easy way to implement Cel Shading into any game would be a welcome feature. Thank you for your attention.