JED - Simple custom End dimension

{
    "dimensions":
    [
        {
            "dim": 123,
            "dimensiontype":
            {
                "id": 1,
                "name": "Custom End",
                "keeploaded": false,
                "worldprovider": "WorldProviderEndJED",
                "require_exact_match": true
            }
        }
    ]
}