json - GET 呼び出しでデータストリームをフィルタリングする

Question

この URL を使用する場合: https://api.xively.com/v2/feeds/65673.json?datastreams=3

Xively はこれを返します:

{ "id":65673,
  "title":"Swimming Pool",
  "private":"false",
  "tags":["arduino","xbee"],
  "description":"Monitors swimming pool conditions",
  "feed":"https://api.xively.com/v2/feeds/65673.json",
  "status":"live",
  "updated":"2013-08-03T22:35:27.489534Z",
  "created":"2012-07-02T00:23:57.518294Z",
  "creator":"https://xively.com/users/scott216",
  "version":"1.0.0",
  "datastreams":[{
      "id":"3",
      "current_value":"76.20",
      "at":"2013-08-03T22:35:27.247712Z",
      "max_value":"93.6","min_value":"-2845.0",
      "tags":["Temp 1"],
      "unit":{"symbol":"F","label":"Degrees"}
  }],
  "location":{
    "disposition":"fixed",
    "exposure":"outdoor",
    "domain":"physical"
  }
}

ただし、current_value 76.20 のみが必要です。URL にフィルターなどを追加して、現在の値のみを返す方法はありますか?