Hi there, Welcome.
This one is a free toon shader distributed in a previous post:
Actually, UE offers a tutorial for “Stylized Rendering” with a sample project available at Unreal Online Learning below. I am not sure if is exactly the same look you’re looking for.
Here you can download the asset pack: Stylize Renders with Post Process Materials in UE Online Learning - UE Marketplace (unrealengine.com)
Hope that helps.