Get data in a tree structure for a custom visual

Hello,

I'm trying to create my first custom visual.

For my visual I need data in a tree structure like this, the tree shouldn't contain duplicates:

{
	name: '...',
	children: [
		{
			name: '...',
			children: [ {}, {}, ...]
		},
		{
			name: '...',
			children: [ {}, {}, ...]
		},
		...
	]
}

Actually I use table data binding and converting the data in the tree structure. But I wonder if there is a way to get the data in this tree structure direcly from Power BI, so that I don't have to convert the data.