json_schema: {
    "properties": {
      "client_name": {
        "description": "The name of the client",
        "type": "string"
      },
      "items": {
        "items": {
          "properties": {
            "description": {
              "description": "The description of the item",
              "type": "string"
            },
            "price": {
              "description": "The price per unit",
              "type": "number"
            },
            "quantity": {
              "description": "The quantity of the item",
              "type": "integer"
            }
          },
          "required": [
            "description",
            "quantity",
            "price"
          ],
          "type": "object"
        },
        "type": "array"
      },
      "tax_rate": {
        "description": "The tax rate in percentage",
        "type": "number"
      }
    },
    "required": [
      "client_name",
      "items"
    ],
    "type": "object"
  }