There is a hole in the left side wall that Samus can fit into by shrinking her hitbox. Once in the wall, stand up if crouched then turnaround into a buffered spinjump to jump out of the acid.

Requires:

{
  "tech": "canPartialFloorClip"
}
"canSuitlessLavaDive"
{
  "or": [
    {
      "and": [
        "canLateralMidAirMorph",
        "canDownBack",
        "canTrickyJump",
        {
          "acidFrames": 110
        },
        {
          "heatFrames": 285
        }
      ]
    },
    {
      "and": [
        "canDash",
        "canTrickyJump",
        {
          "acidFrames": 140
        },
        {
          "heatFrames": 300
        }
      ]
    },
    {
      "and": [
        {
          "acidFrames": 230
        },
        {
          "heatFrames": 390
        }
      ]
    }
  ]
}