Using WPO to push/bend away from camera

I’d like to have polys that are close to the camera get pushed away from it so it feels like the level is warping around the camera.

I have a feeling this is quite easy to do with WPO - using the absolute world position & camera position nodes, but I’m just not quite sure how to do it (awful at maths). Hoping someone might be able to set me in the right direction.