Sequential Structure Spawn (CoFH World)

{
    "populate": {
        "gorgon_temple_sand": {
            "distribution": "sequential",
            "generator": {
                "type": "structure",
                "material": "minecraft:sand",
                "structure": [{"name": "./structures/gorgon_temple_sand.nbt"}]
            },
            "distribution": "custom",
            "cluster-count": 1,
            "chunk-chance": 15,
            "x-offset": 0,
            "y-offset": {"min": 53,"max": 56},
            "z-offset": 0,
            "features": [
                {
                    "distribution": "custom",
                    "generator": {
                        "type": "structure",
                        "material": "minecraft:air",
                        "structure": [{"name": "./structures/gorgon_temple_roof.nbt"}]
                    },
                    "cluster-count": 1,
                    "x-offset": 0,
                    "y-offset": {
                        "value-a": ${populate.gorgon_temple_sand.y-offset},
                        "value-b": 20,
                        "operation": "ADD"
                    },
                    "z-offset": 0
                }
            ],
            "biome": {
                "restriction": "whitelist",
                "value": [
                    {
                        "type": "id",
                        "entry": ["minecraft:beaches"]
                    }
                ]
            },
            "dimension": {
                "restriction": "whitelist",
                "value": [
                    0
                ]
            }
        }
    }
}