Config

This is the basic config the file has been truncated due to the size

overworld {
    biome="minecraft:mutated_forest"
    block=[
        {
            blocktype="minecraft:diamond_ore"
            weight=1
        },
        ...
        {
            blocktype="minecraft:lava[level=0]"
            weight=1
        }
    ]
    items=[
        {
            amount {
                fixed=false
                max=16
                min=1
            }
            itemstack {
                ContentVersion=1
                Count=1
                ItemType="minecraft:sapling"
                UnsafeDamage=0
            }
            weight=1
        },
        ...
        {
            amount {
                fixed=false
                max=16
                min=1
            }
            itemstack {
                ContentVersion=1
                Count=1
                ItemType="minecraft:cooked_chicken"
                UnsafeDamage=0
            }
            weight=1
        }
    ]
    spawn-chests=true
    spawn-spawners=true
    spawners=[
        {
            entity="minecraft:llama"
            weight=1
        },
        ...
        {
            entity="minecraft:slime"
            weight=1
        }
    ]
}