Requires:

{
  "obstaclesCleared": [
    "A"
  ]
}
{
  "or": [
    "h_heatProof",
    {
      "and": [
        {
          "heatFrames": 690
        },
        {
          "or": [
            {
              "ammo": {
                "type": "Super",
                "count": 3
              }
            },
            {
              "ammo": {
                "type": "Missile",
                "count": 6
              }
            },
            "ScrewAttack",
            "Plasma",
            "Spazer",
            "Wave"
          ]
        }
      ]
    }
  ]
}
{
  "or": [
    {
      "and": [
        "canCarefulJump",
        {
          "heatFrames": 420
        }
      ]
    },
    {
      "and": [
        {
          "heatFrames": 720
        },
        {
          "lavaFrames": 60
        }
      ]
    }
  ]
}

Unlocks doors:

{"types":["missiles"],"requires":[{"heatFrames":20}]}

Dev note: This can be used for collecting the item without needing to reset the room.