This is the easiest part.
The URL of your API is the Database URL part + the bucket or the path to your required key + .json
Do this and you will get the JSON value of that key.
You don’t really lose any thing, you will replace the DB Get block with API block using a simple 3 part URL.
@jared had shared the planet names from his Firebase account using this
https://jared-gibb-project-123-default-rtdb.firebaseio.com/.json
See this link