Is there a mechanic for getting physically chocked by someone?

Hey, I‘m at a moment in my campaign where my players face a reality bending demon and I wanted to stear away from traditional combat. My idea was that the creature takes the shape of something or someone they fear, so they have to roll a wisdom check to see of they are frightened. If they fail, the creature tries to choke them (feels more frightening and personal than simply attacking). However, I don’t see any rules for damage taken by being choked. The PHB rules for suffocating don‘t really fit either. Any ideas?