Retrieve subjects

{
  "topic": "com.acme/the_policy_id/policies/commands/retrieve",
  "headers": {
    "content-type": "application/vnd.eclipse.ditto+json"
  },
  "path": "/entries/the_label/subjects"
}

{
  "topic": "com.acme/the_policy_id/policies/commands/retrieve",
  "headers": {
    "content-type": "application/vnd.eclipse.ditto+json"
  },
  "path": "/entries/the_label/subjects",
  "value": {
    "google:the_subjectid": {
      "type": "yourSubjectTypeDescription"
    }
  },
  "status": 200
}