Entrance condition:

{
  "comeInWithGrappleSwing": {
    "blocks": [
      {
        "position": [
          13,
          5
        ],
        "environment": "water",
        "note": "Mt. Everest"
      }
    ]
  }
}

Requires:

"canPreciseGrappleJump"

Dev note: This can work from other setup rooms, but it would have no purpose coming from an air room, since you could just do a running jump through the door and airball.