Solved
If the Devs can structure the coding similar to https://www.w3schools.com/howto/howto_js_treeview.asp, then you should be able to perform a click on the name to expand the nodes.
I've found an example website that uses <span> on a tree view. The following coding is able to click on Beverages and expand the nodes.
I suggest you try to perform a click on "Node 1" text