Writing data to Firebase Realtime Database

I am new to node red and I am trying to use it to send data to firebase realtime database.
How can I make it so that I don't just add a new instance of temperature but instead create a new key called temperature every time node red sends data to the database. My database looks like this:

And I want to make it look this whenever the node red sends new data:
Please don't mind the ID its just tutorial I am trying to base on.
I'm not quite sure if the terms I'm using is correct and you understand my problem but I hope someone will be able to help me. Thank you in advance.

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