xViz Gantt Chart. Only TWO task-levels are really ok ?

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Hi !
1) If task hierarchy is ragged one and described by parent-child relation like in MS Project ODATA tables and other PM tools. What do you advise to set in xViz Gantt Chart ‘Task Name’ field to display multilevel and ragged task structure ?

2) I think https://xviz.com/blogs/visualize-microsoft-project-data-in-power-bi-using-xviz-gantt-chart/ case is wrong.  If you add ParentTaskName and TaskName in  xViz Gantt Chart ‘Task Name’ field you just get “two level mess of tasks”  if your project has more then 2 outline levels.

Edited question