EXAMPLE: Bonus rolls

{
    "pools": [
        {
            "rolls": 1,
            "bonus_rolls": 1,
            "entries": [
                {
                    "type": "item",
                    "name": "minecraft:diamond",
                    "weight": 1
                }
            ]
        },
        {
            "rolls": 1,
            "bonus_rolls": {
                "min": 2,
                "max": 6
            },
            "entries": [
                {
                    "type": "item",
                    "name": "minecraft:stone",
                    "weight": 1
                }
            ]
        }
    ]
}