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In Tree Grid, we have "AddRow" default context menu option, using which we can add new row with "Above" and "Below" newRowPosition. But we could not add new record as "Child". Need to provide support for the same.
Help doc: https://ej2.syncfusion.com/documentation/treegrid/context-menu/
https://ej2.syncfusion.com/documentation/treegrid/edit/#adding-row-position