How to push two values to the same key from Arduino to Firebase

I would like to push two values at the same time (to the same node) from arduino to firebase. I tried to create an array and push the array to firebase, however, that is not working.

Here are the two values that I'm pushing, but I would like to push them to the same unique key:

temp1 = sensors.getTempCByIndex(0);
 StaticJsonBuffer<50> jsonBuffer;
JsonObject& timeStampObject = jsonBuffer.createObject();
timeStampObject[".sv"] = "timestamp";

Firebase.push("Sensors/20/temperatures/001", temp1);
Firebase.push("Sensors/20/temperatures/001", timeStampObject);

I attached a screenshot of how my database should look like.

Thanks in advance!

example.PNG

This solved the problem:

StaticJsonBuffer<256> jsonBuffer;
JsonArray& array = jsonBuffer.createArray();
array.add(timeStampObject);
array.add(temp1);
Firebase.push("Sensors", array);