How to parse through nested JSON array and add in values in Java?

Question

I've been stuck on coming up with an algorithm that deals with nested JSON, any help is appreciated. Basically, I am trying to handle a response in a processor class in my spring boot application. The JSON array that I'm trying to process has a structure like this:

[
  {
    "request": [
      {
        "Item1": {...},
        "Item2": {...},
        "List1": ["", ""],
        "language": "en_US",
        "Item3": {...},
        "aTree": {
          "tag_key": "tag1",
          "object": [
            "String01",
            "String02",
            "String03"
          ]
        }
      }
    ],
    "response": [
      {
        "Item1": {...},
        "Item2": {...},
        "List1": ["", ""],
        "language": "en_US",
        "Item3": {...},
        "aTree": {
          "tag": "tag1"
        }
      }
    ],
    "jar": {...}
  },
  {
    "request": [
      {
        "Item1": {...},
        "Item2": {...},
        "List1": ["", ""],
        "Item3": {...},
        "aTree": {
          "tag": "tag1"
        },
        "Item4": {...}
      }
    ],
    "response": [...],
    "jar": {...},
  }
]

Each object in the array has three JSON arrays: request , response and jar . As shown in the sample above, These arrays may contain objects with the "aTree" property. "aTree" can either have a property called "tag_key" or "tag" , when "tag_key" exists, another property called "object" with an array of strings is always found after it.

What I need is a function that takes in the JSON array as a parameter, then somehow parses through the array to find the "tag_key" and "object" property, then the function will store the value of "object" in relation to the value of "tag_key". So that the function can repopulate all the other "aTree" objects with the value of "object" whenever there's a matching "tag" value. With the example above, the expected output after running the function should be: ( notice the added "object": [...] after "tag" because value of "tag" matches the value of "tag_key" )

[
  {
    "request": [
      {
        "Item1": {...},
        "Item2": {...},
        "List1": ["", ""],
        "language": "en_US",
        "Item3": {...},
        "aTree": {
          "tag_key": "tag1",
          "object": [
            "String01",
            "String02",
            "String03"
          ]
        }
      }
    ],
    "response": [
      {
        "Item1": {...},
        "Item2": {...},
        "List1": ["", ""],
        "language": "en_US",
        "Item3": {...},
        "aTree": {
          "tag": "tag1"
          "object": [
            "String01",
            "String02",
            "String03"
          ]
        }
      }
    ],
    "jar": {...}
  },
  {
    "request": [
      {
        "Item1": {...},
        "Item2": {...},
        "List1": ["", ""],
        "Item3": {...},
        "aTree": {
          "tag": "tag1"
          "object": [
            "String01",
            "String02",
            "String03"
          ]

        },
        "Item4": {...}
      }
    ],
    "response": [...],
    "jar": {...},
  }
]