Well, I suppose it's possible but it would require that the cat (or cats?) hang out and watch me express displeasure with the odor under my porch. And actually, the peeing under the porch came first as I don't really care if the neighborhood cats wander across my lot; my issue with the cats is their use of the area under my porch as their bathroom.
Personally, I’d love to see you express displeasure!
Hope you can fix up the urine smell. Cats’ urine is the very worst of the worst.