Can postUrl be used to make a POST that contains a JSON body?

I am trying to make a POST to a Google Calendar API and I need my POST in the following format:

URL TO POST TO https://www.googleapis.com/calendar/v3/calendars/someone@example.com/events?key={YOUR_API_KEY} HEADERS

Content-Type: application/json Authorization: Bearer MyTokenMyTokenMyTokenMyTokenMyToken

  
   
    
     REQUEST CONTENT (BODY)
    
    
     
     {
    
    
     
      
        "end": {
      
      
       
         "dateTime": 
        "2014-04-19T17:30:00.000+05:30"
       
      
      
        },
      
     
     
      
        "start": {
      
      
       
         "dateTime": 
        "2014-04-19T16:00:00.000+05:30"
       
      
      
        },
      
     
     
       "summary": 
      "Trial Event"
     
    
    
     }

Here is the ZOHO Creator code that I am using:

Map_for_Calendar_API = map();

Map_for_Calendar_API.put("summary", "Trial Event");

Map_for_EndDate = map();

Map_for_EndDate.put("dateTime", ("2014-04-19T17:30:00.000+05:30"));

Map_for_Calendar_API.put("end", Map_for_EndDate);

Map_for_StartDate = map();

Map_for_StartDate.put("dateTime", ("2014-04-19T16:00:00.000+05:30"));

Map_for_Calendar_API.put("start", Map_for_StartDate);

Header_Map = map();

Header_Map.put("Content-Type", "application/json");

Header_Map.put(" Authorization ", " Bearer MyToken MyToken MyToken MyToken MyToken ");

Google_Calender_Event_Post_Variable = postUrl("https://www.googleapis.com/calendar/v3/calendars/someone@gmail.com/events?key=<myKey>, Map_for_Calendar_API.toString(), Header_Map, false);

However, I am not getting the JSON formatted correctly.

Here is what my request body ends up like when the POST is fired from ZOHO Creator:

{"summary":"Trial Event","start":"{dateTime=2014-04-19T16:00:00.000+05:30}","end":"{dateTime=2014-04-19T17:30:00.000+05:30}"}

Below is the expected format (observe carefully the quotes, linebreaks don't matter in JSON):

  
   {
  
  
   
    
      "end": {
    
    
     
       "dateTime": 
      "2014-04-19T17:30:00.000+05:30"
     
    
    
      },
    
   
   
    
      "start": {
    
    
     
       "dateTime": 
      "2014-04-19T16:00:00.000+05:30"
     
    
    
      },
    
   
   
     "summary": 
    "Trial Event"
   
  
  
   }

It seems like Zoho Creator cannot convert a nested Map to a proper JSON.

Is there a workround that anyone as tried when POST ing a nested map structure in JSON format in a POST.