Is there any variable which holds the values of rows in pivot?

To get the value ,we use obj[this.id] which holds the variable value present in VALUE. In similar way is there any way or variable which can be used to get the value of rows in tree structure(data that are present in tree structure of pivot table)

@Listopad @Helga Can anyone help with this issue… i need to append the count value to the data present in the tree structure in each level $level
For eg:In the below snippet, It should be like
$level1 : Republic(24)
$level 2: South America(3)
$level 2 :Europe(11)

So for the above scenario i need the varaible or place holder name which hols the value of tree structure(Rows) in pivot grid

https://snippet.webix.com/cqscagme

The answer in the related discussion https://forum.webix.com/discussion/comment/20381/#Comment_20381