EXAMPLE: NBT data

{
    "pools": [
        {
            "rolls": 1,
            "entries": [
                {
                    "type": "item",
                    "name": "minecraft:diamond_sword",
                    "weight": 1,
                    "functions": [
                        {
                            "function": "set_nbt",
                            "tag": "{display:{Name:\"§kCustom Name§r\",Lore:[\"Line 1\",\"Line 2\"]},CustomTag:1b}"
                        }
                    ]
                }
            ]
        }
    ]
}