Ostensibly the Generation 2 Ground Launched Small Diameter Bomb munitions will do something like this - i.e. they're capable of independently acquiring targets, and then de-conflict the target acquisitions to ensure they don't all track on the same one.
Basically the idea being that you fire a whole lot of them at the enemy trench somewhere over there, and on terminal approach they independently assign themselves to specific interesting looking targets.
Sort of like the CBU-97, it's mission profile is ridiculously insane. First 10 sub munitions are ejected out. A parachute slows the downward movement of the sub munition carrier. A rocket then spins it up to a high speed where it starts flinging shaped charge skeet at vehicles in range. these skeet then detonate once they detect they are above the vehicle.
My reaction was the same as when I first learned about how jpl was going to get the curiosity rover down to the surface of mars with a rocket crane. "There is no way something that complicated would actually work."
Probably pretty easy. Anything that's not flat terrain, kinda irregular in shape, and a fixed distance from another target, e.g. 3 meters or something, to ensure a reasonable spread.
Basically the idea being that you fire a whole lot of them at the enemy trench somewhere over there, and on terminal approach they independently assign themselves to specific interesting looking targets.