isaacburns Create a transform constraint with modified rotation. Rotation exported as "x" in JSON; should be "rotation" (like bones) or "rotate" (following "rotateMix" notation).
Pharan Confirmed. When I have offsets rotate 58, x -18, y 21, the json outputs: "transform": [ { "name": "hold gun", "bone": "gun", "target": "gunHeld", "x": 58, "x": -18, "y": 21 }