Bit Pixellize in android (or similar effect)

I’m just learning to use unreal engine
I want to make a game in android using a pixelated effect, i found a tutorial in the official youtube page of unreal engine :

it works perfect in windows but not in android, i search some information then i realize it’s unsupported on mobile

How i can add a pixelated effect in android?

May if i just use a really low resolution scale…?
but i dont know how reduce it any more than this: