Cheapest (performance wise) fog for GLES2 mobile VR - how?

How can I have a simple fog, as seen on the images below, in UE4 for GLES 2.0 mobile (VR) platform ? Thanks!

Hmm… So, not possible ? :confused:

Possible if done through material tinting: Cheapest (performance wise) fog for GLES2 mobile VR (LDR) - how? - Rendering - Unreal Engine Forums