I want to parse some data from JSON using Jolt Spec. I have JSON data:

[
  {
    "ID": "828",
    "CASE_ID": "33487784",
    "PIN": "43001005357",
    "INP_DATE": "1762200000000"
  },
  {
    "ID": "829",
    "CASE_ID": "33457761",
    "PIN": "59001024356",
    "INP_DATE": "1762200000000"
  }
]

Jolt Spec:

[
  {
    "operation": "shift",
    "spec": {
      "*": {
        "PIN": "keys[&1]"
      }
    }
  },
  {
    "operation": "modify-overwrite-beta",
    "spec": {
      "PINS": "=join(',', @(1,keys))"
    }
  },
  {
    "operation": "remove",
    "spec": {
      "keys": ""
    }
  }
]

and now have result:

{
  "PINS" : "43001005357,59001024356"
}

But I want this:

{
  "PINS" : "'43001005357','59001024356'"
}

I used https://jolt-demo.appspot.com/ web-site for compile.

Please help.