Hi DaDarkDragon!
- Ninja is performing the simulation in a 2D vector space without generating surface normal information. However: you may have noticed the “shading” slider, that could make the fluids look like they are 3D. I have created a Material Function that builds the shading from the available information. The same function could be used to create normal maps. I have quickly created this “Normal from Height map” function for you, could be used under UE 4.20 (and above): LINK
- There are free, online tools that could generate normal maps from the ninja simulation density data: simply upload your density map flipbook here, and generate normal from it: LINK
- Finally, here is a cross-link to a related Unreal Forums topic: LINK
Hope you could forge what you need 
Cheers, AK