I am working on developing an app with the regular builder and not CLI. I need to pass contact information from sources like forms or CRMs. 

I can add the Action of add contact and use the API resource of Subscribers. I am able to pass the email, but nothing else. 

I tries using the Line Item Group, like I did for Order Information (another Action), but there seems to be more nested data. I see Custom Fields, Field Name and Value. 

Is there a way to do this without using CLI?

Here is the example API documentation:

POST https://edapi.campaigner.com/v1/Subscribers HTTP/1.1
ApiKey: 67c27802-f234-4196-b44c-460245d4978e
Content-Type: application/json

{
  "EmailAddress": "jason@example.net",
  "CustomFields": e
    {
      "FieldName": "FirstName",
      "Value": "Bob"
    },
    {
      "FieldName": "Age",
      "Value": "32"
    },
    {
      "FieldName": "OtherDate",
      "Value": "6/13/2011"
    }
  ],
  "Publications": i
    1,
    3
  ]
}