Atlassian Document Format POST Request to create JIRA issue using V3

gistfile1.txt

{
    "fields": {
       "project":
       {
          "key": "DT"
       },
       "summary": "JIRA REST via postman",
       "description": {
           "type": "doc",
           "version": 1,
           "content": [
               {
                   "type": "paragraph",
                   "content": [
                       {
                           "type": "text",
                           "text": "creating an issue using project keys"
                       }
                   ]
               }
           ]
               },
       "issuetype": 
       {
          "name": "Task"
       }
   }
}