meta/modality.json

{
    "state": {
        "arm": {
            "start": 0,
            "end": 6
        },
        "gripper": {
            "start": 7,
            "end": 8
        }
    },
    "action": {
        "arm": {
            "start": 0,
            "end": 6
        },
        "gripper": {
            "start": 7,
            "end": 8
        }
    },
    "video": {
        "camera": {
            "original_key": "observation.images.camera"
        }
    }
}