JED 1.6.0+ - Void with normal biomes and a spawn structure

{
    "dimensions": [
        {
            "dim": 123,
            "normal_biomes": true,
            "dimensiontype": {
                "id": 123,
                "name": "Some void dim",
                "keeploaded": false,
                "worldprovider": "WorldProviderSurfaceJED",
                "require_exact_match": true
            },
            "spawn_structure": {
                "name": "foo_bar.schematic",
                "centered": true,
                "offset": [8, -3, 0]
            },
            "worldinfo_onetime": {
                "generatorName": "flat",
                "generatorOptions": "3;minecraft:air;1;",
                "SpawnX": 256,
                "SpawnY": 32,
                "SpawnZ": 256,
                "GameRules": {
                    "spawnRadius": "0"
                }
            }
        }
    ]
}