has the following format

{
    "2": {
        "id": 2,
        "name": "demo1",
        "lv1": {
            "4": {
                "id": 20,
                "name": "demo1-1",
                "lv2": {
                    "2": {
                        "id": 2,
                        "name": "demo1-1-1"
                    },
                    "3": {
                        "id": 3,
                        "name": "demo1-1-2"
                    }
                }
            },
            "7": {
                "id": 23,
                "name": "demo1-2"
            }
        }

    },

    "3": {
        "id": 4,
        "name": "demo2",
        "lv1": {
            "6": {
                "id": 34,
                "name": "demo2-1",
                "lv2": {
                    "3": {
                        "id": 3,
                        "name": "demo2-1-1"
                    }
                }
            },
            "8": {
                "id": 55,
                "name": "demo2-2"
            }
        }
    }
}

needs to be converted to this format

[{
        "value": "2",
        "text": "demo1",
        "children": [{
            "value": "20",
            "text": "demo1-1",
            "children": [{
                    "value": "2",
                    "text": "demo1-1-1"
                },
                {
                    "value": "3",
                    "text": "demo1-1-2"
                }
            ]
        }]
    },
    {
        "value": "4",
        "text": "demo2",
        "children": [{
                "value": "34",
                "text": "demo2-1",
                "children": [{
                    "value": "3",
                    "text": "demo2-1-1"
                }]
            },
            {
                "value": "55",
                "text": "demo2-2"
            }
        ]
    }
]

requires that the value of the new data corresponds to the id of the original data. The novice debugged it for a whole day without any effect. Seek Daniel"s solution.