Multiple Json to one single json convert

I have few json files in a folder. I want a output.json file which contains file_name and person. But in the json files there may be repeated person i.e. 1,3,1,4,2. I need only the person where it repeats.

Output: "File_name": [1]

Input json:

{
    "name" : {
    "file_name" : "File_name" 
    },
    "xyz": [
        {
            "name": "xyz",
            "person": 1,
            "value": [
                10,
                20
            ]
        },
        {
            "name": "assa",
            "person": 6,
            "value": [
                20,
                40
            ]
        },
        {
            "name": "sdsadas",
            "person": 3,
            "value": [
                49,
                38
            ]
        },
        {
            "name": "dsd",
            "person": 3,
            "value": [
                89,
                81
            ]
        }
    ]
}