I don't understand the config

Quote

"Loot profiles": [
    {
      "Loot source": "Woodcutting",
      "Prefab shortname, boss profile, event name [null if not required]": null,
      "A list of required skin IDs [null if not required]": [],
      "Identifiers to exclude from consideration [List - null if not required]": [],
      "Drop chance [%]": 0.5,
      "Should we consider loot chance modifiers that the player may have?": false,
      "Items that can drop from this source [profile name: drop weight]": {
        "lumberjack’s haste": 100
      }
    },
    {
      "Loot source": "Mining",
      "Prefab shortname, boss profile, event name [null if not required]": null,
      "A list of required skin IDs [null if not required]": [],
      "Identifiers to exclude from consideration [List - null if not required]": [],
      "Drop chance [%]": 1.0,
      "Should we consider loot chance modifiers that the player may have?": false,
      "Items that can drop from this source [profile name: drop weight]": {
        "smelter's soup": 100
      }
    },
    {
      "Loot source": "Fishing",
      "Prefab shortname, boss profile, event name [null if not required]": null,
      "A list of required skin IDs [null if not required]": [],
      "Identifiers to exclude from consideration [List - null if not required]": [],
      "Drop chance [%]": 3.0,
      "Should we consider loot chance modifiers that the player may have?": false,
      "Items that can drop from this source [profile name: drop weight]": {
        "fisherman's wharf pie": 70,
        "deep sea tincture": 30
      }
    },
    {
      "Loot source": "Barrel",
      "Prefab shortname, boss profile, event name [null if not required]": null,
      "A list of required skin IDs [null if not required]": [],
      "Identifiers to exclude from consideration [List - null if not required]": [],
      "Drop chance [%]": 1.5,
      "Should we consider loot chance modifiers that the player may have?": false,
      "Items that can drop from this source [profile name: drop weight]": {
        "fortune cookie": 100
      }
    },
 

Am I supposed to put in the crate prefabs I want these items to spawn in or something? Can't you just provide a list of crates with true false?