Give crows a reward, and they'll remember your face/clothing
Scare them away, and they'll also remember your face/clothing
If anyone hypothetically wanted to, they could buy lots of dry cat food (which crows love), and teach them to like you
And you could also try to trample them/shoo them off, wearing CERTAIN UNIFORMS, teaching them to hate people who wear said uniforms
This handy guide was posted not long ago. My own experiments are ongoing. https://lifehacker.com/how-to-befriend-crows-and-turn-them-against-your-enemie-1849393502