old_contents: park_list = [
      {
          "contractCode": "NRSO",
          "parkId": 74098
      }
  ]
  
new_contents: park_list = [
      {
          "contractCode": "NRSO",
          "parkId": 74098
      },
      {
          "contractCode": "NRSO",
          "parkId": 70459
      },
      {
          "contractCode": "NRSO",
          "parkId": 70230
      },
      {
          "contractCode": "NRSO",
          "parkId": 70231
      }
  ]
  
subject: add parks