This is an example of the current spawn bonus chest loot table in Minecraft, in the (possibly) new loot table data format.

spawn_bonus_chest.json

[
  {
    "item": "minecraft:stick",
    "weight": 10,
    "minecraft:set_count": {
      "min": 1,
      "max": 3
    }
  },
  {
    "item": "minecraft:planks",
    "weight": 10,
    "minecraft:set_count": {
      "min": 1,
      "max": 3
    }
  },
  {
    "item": "minecraft:log",
    "weight": 10,
    "minecraft:set_count": {
      "min": 1,
      "max": 3
    }
  },
  {
    "item": "minecraft:stone_axe",
    "weight": 3
  },
  {
    "item": "minecraft:wooden_axe",
    "weight": 5
  },
  {
    "item": "minecraft:stone_pickaxe",
    "weight": 3
  },
  {
    "item": "minecraft:wooden_pickaxe",
    "weight": 5
  },
  {
    "item": "minecraft:apple",
    "weight": 5,
    "minecraft:set_count": {
      "min": 2,
      "max": 3
    }
  },
  {
    "item": "minecraft:bread",
    "weight": 3,
    "minecraft:set_count": {
      "min": 2,
      "max": 3
    }
  },
  {
    "item": "minecraft:log2",
    "weight": 10,
    "minecraft:set_count": {
      "min": 1,
      "max": 3
    }
  }
]