JED 1.6.0+ - WorldInfo overrides, with per-dim difficulties

{
    "dimensions": [
        {
            "dim": 0,
            "worldinfo": {
                "Difficulty": 0,
                "DifficultyLocked": 1
            }
        },
        {
            "dim": 123,
            "worldinfo": {
                "Difficulty": 2,
                "DifficultyLocked": 1
            }
        },
        {
            "dim": 124,
            "worldinfo": {
                "Difficulty": 2,
                "DifficultyLocked": 1
            }
        },
        {
            "dim": 125,
            "worldinfo": {
                "Difficulty": 2,
                "DifficultyLocked": 1
            }
        }
    ]
}