Requires:

{"obstaclesCleared": ["B", "C"]},
"canLongIBJ",
{"or": [
  {"heatFrames": 2090},
  {"and": [
    "canJumpIntoIBJ",
    {"or": [
      {"heatFrames": 1510},
      {"and": [
        "canDoubleBombJump",
        {"heatFrames": 980}
      ]},
      {"and": [
        "HiJump",
        "canDoubleBombJump",
        {"heatFrames": 860}
      ]}
    ]}
  ]}
]},
{"or": [
  {"obstaclesCleared": ["A"]},
  "canPowerBombMidIBJ",
  {"haveBlueSuit": {}},
  {"and": [
    "canBombAboveIBJ",
    {"heatFrames": 60}
  ]}
]}

Clears obstacles: A

Dev note: This assumes the bottom bomb blocks are completely broken, making it necessary to start the IBJ from the bottom of the room.