{
  "data": {
    "organizationId": "yourOrganizationId",
    "documentId": "yourDocumentId",
    "annotationId": "yourAnnotationId",
    "commentData": [
      {
        "commentText": "Sample Comment",
        "commentHtml": "<div>Hello</div>",
        "from": {
          "userId": "yourUserId"
        }
      }
    ]
  }
}

{
  "result": {
    "status": "success",
    "message": "Comment(s) added successfully.",
    "data": [
      778115
    ]
  }
}

{
  "error": {
    "message": "ERROR_MESSAGE",
    "status": "INVALID_ARGUMENT"
  }
}