如何使用 Powershell 将 JSON 对象保存到文件中

I have converted the following JSON file to powershell representation object.

{
"computer": [
    {
        "children": [   
            {   
                "children": [ {
                   "children": [ {
                        "path": "T:\Dropbox\kvaki.html",
                        "name": "kvaki",
                        "type": "url",
                        "url": "http://example.com"
                   } ],
                    "path": "T:\Dropbox\",
                    "name": "Njusha",
                    "type": "folder"
                }, {
                    "path": "T:\Dropbox\Europa.html",
                    "name": "Europa",
                    "type": "url",
                    "url": "http://example.com"
                }, {
                    "path": "T:\Dropbox\math.html",
                    "name": "math",
                    "type": "url",
                    "url": "http://example.com"
                } ],
                "path": "T:\Dropbox\",
                "name": "Money",
                "type": "folder"
            }
        ],
        "full_path_on_file_sys": "T:\Dropbox\"
    }
]

}

After doing some computations with powershell representation I would like to save it to file as JSON. But command $jsonRepresentation | ConvertTo-Json | Out-File "D:\dummy_path\file.json" saves it in this way

{
    "computer":  [
                     {
                         "children":  " ",
                         "full_path_on_file_sys":  "T:\Dropbox\"
                     }
                 ]
}

Question: how to achieve correct saving of complex powershell JSON representation?个