I have configured Dynamic Fields to fetch user defined fields with a custom API calls.

const options = {
  url: 'https://api.legodesk.com/case/rest/contact/fetch/custom/fields',
  method: 'GET',
  headers: {
    'Accept': 'application/json',
    'Authorization': bundle.authData.Authorization,
  },
  params: {

  }
}

return z.request(options)
  .then((response) => {
    response.throwForStatus();
    const results = response.json;

    return results;
  });

//This Api will return as per below format data. 

o
   {
      "id": "61d2936e9c3eec05bcdd0d73",
      "label": "2nd Phone Number",
      "key": "lego_ylog_2nd_Phone_Number",
      "type": "text",
      "helpText": null,
      "placeholder": null,
      "required": false,
      "dynamic": null,
      "choices": ]
   }
]

Now i want configure Dynamic Fields into the action but my actual body request for the API is

{
   "firstName": "Mohan Kumar",
   "lastName": "Mohan Kumar",
   "email": "mohan4534@gmail.com",
   "phone": "9567687987",
   "gender": "Male",
   "address": "Bangalore",
   "district": "Bangalore",
   "state": "Karnataka",
   "dob": "2000-01-06T07:46:09.161Z",
   "pin": 560068,
   "customField": {
      "lego_ylog_2nd_Phone_Number": "8976786756"
   }
}

How to configure Dynamic Fields into the action API request as per above? 

const options = {
  url: 'https://api.legodesk.com/case/rest/contact/create/new/or/update',
  method: 'POST',
  headers: {
    'Content-Type': 'application/json',
    'Accept': 'application/json',
    'Authorization': 'bundle.authData.Authorization'
  },
  params: {

  },
  body: {
    'firstName': 'bundle.inputData.firstName',
    'lastName': 'bundle.inputData.lastName',
    'email': 'bundle.inputData.email',
    'phone': 'bundle.inputData.phone',
    'gender': 'bundle.inputData.gender',
    'address': 'bundle.inputData.address',
    'district': 'bundle.inputData.district',
    'state': 'bundle.inputData.state',
    'pin': 'bundle.inputData.pin',
    'dob': 'bundle.inputData.dob'
  }
}

return z.request(options)
  .then((response) => {
    response.throwForStatus();
    const results = response.json;

    // You can do any parsing you need for results here before returning them

    return results;
  });