Use column keys on UI designer form for nested JSON

Q&A
1

Hi, I am a new user of Bonita, I wanna ask how can I use column keys feature on UI Designer (Form Editor) to filter nested JSON.
All of the examples that I can find use a direct JSON data (the JSON data straightforward into an array)

Example of direct JSON data :

[
  {
    "postId": 1,
    "id": 1,
    "name": "id labore ex et quam laborum",
    "email": "Eliseo@gardner.biz",
    "body": "laudantium enim quasi est quidem magnam voluptate ipsam eos\ntempora quo necessitatibus\ndolor quam autem quasi\nreiciendis et nam sapiente accusantium"
  },
  {
    "postId": 1,
    "id": 2,
    "name": "quo vero reiciendis velit similique earum",
    "email": "Jayne_Kuhic@sydney.com",
    "body": "est natus enim nihil est dolore omnis voluptatem numquam\net omnis occaecati quod ullam at\nvoluptatem error expedita pariatur\nnihil sint nostrum voluptatem reiciendis et"
  }
]

and in my case, I need to get my JSON data from a nested form.

Example for nested JSON data:

{
"_type":"Collection",
"total":2,
"count":2,
"pageSize":20,
"offset":1,
"_embedded":
    {
        "elements":    
        [
            {
                "_type":"Project",
                "id":3,
                "identifier":"api-test-boi",
                "name":"API test boi",
            },
            {
                "_type":"Project",
                "id":2,
                "identifier":"your-scrum-project",
                "name":"Scrum project",
            },
        ]
    }
}

Please help me and thanks smiley

P.S I tried using column keys with this format frown:

name

_embedded.elements[0].name

$_embedded.elements[0].name

elements[0].name|_embedded