Leash Mobs to Cushions to make them Sit

Like how we can leash mobs together, or to fences and other entities, and leashing a boat to a happy ghast results in a unique specific behavior, leashing a mob to a cushion would make them sit down on the cushion. Maybe bigger mobs need a 2x2 cushion square

Cats dogs and parrots you could just right click to make them sit on the cushion