We go to the Database menu option on our left. In the following screenshot, I have already added a node to the root node, the book node:

Hovering over our root element, we are presented with a + character that allows us to add a child to the root. Of course, we can also create more complex objects by clicking on a specific element and adding child nodes to them that look something like this:

As you can see, we can quite easily build out our database and it has a JSON-like appearance.