Please check the app store. https://appstore.home.mendix.com/link/app/1356/
Its an old beast, avoid it if you can https://appstore.home.mendix.com/link/app/294/
Please note that there are different providers and support levels n the app store content.
If you only want to show one parent-child relation, on a page ad these items:
If you are looking for a n-level datatree, you might want to feed the data to
You can also opt for the widget I created, based on the D3 library:
It also comes with a test project which is completely setup with dummy data already: