JED 1.6.0+ - All-Forest dimension without structures, with water & lava lakes

{
    "config_version": {
        "id": "__default",
        "version": 0
    },
    "dimensions": [
        {
            "dim": 123,
            "biome": "minecraft:forest",
            "dimensiontype": {
                "name": "All Forest without Caves",
                "worldprovider": "WorldProviderSurfaceJED",
                "require_exact_match": true
            },
            "worldinfo_onetime": {
                "MapFeatures": 0,
                "generatorOptions": "{\"useCaves\":false,\"useRavines\": false,\"lavaLakeChance\":500,\"waterLakeChance\":20}"
            }
        }
    ]
}