You can, I believe, get repair kits which might contain reinforcing things with holes that let the liquid plastic through. You can do it yourself with mesh, or thin plate with holes in.OK will have a go with my hot air plastic welder, but teh bumper centre section is so brittle
Amazingly that it extremely close to where the damage on mine is. The fog lamp remained mearly intact.When I got mine the o/s fog lamp was broken along with the bumper so I took the bumper to a local body shop who built up/plastic welded & reinforced that area & for £50 did a splendid job leaving me to just add a replacement lamp off flea bay.