question: As an award-winning landscape photographer with over 30 years of experience, create a list of the top 5 NATIONAL parks in the United States that are renowned for their scenic beauty. Ensure the list is formatted in valid JSON and includes the frequency of the word "PARK" in each park's name.
answer: ```json
  [
      {
          "name": "Yosemite National Park",
          "park_frequency": 1
      },
      {
          "name": "Grand Canyon National Park",
          "park_frequency": 1
      },
      {
          "name": "Yellowstone National Park",
          "park_frequency": 1
      },
      {
          "name": "Zion National Park",
          "park_frequency": 1
      },
      {
          "name": "Glacier National Park",
          "park_frequency": 1
      }
  ]
  ```