How to get a mob to attack an entity they cant see

Im trying to make a small mod that has a monster that attacks cows. I need the monster to be able to start running towards the cow without having a direct sightline of it. kinda similar to how pillagers are with villagers, even though they cant see the villager they move towards the villager and attack it. Is there anyway to do this or replicate the pillagers behavior with villagers except with a cow instead?