You can make use of other widgets Template grid or list view, to show your list of objects of report
By using this widget you can show your reports in card view, vertical or horizontal tables as per your need
Maybe I misread your question but could it be solved by a dataview that listens to the data grid and then inside the dataview the report grid?
Otherwise explain a bit more what you are trying to achieve here.
Alternatives of ReportGrid: DataGrid, ListView, TemplateGrid.
What is needed is purely dependent on your business requirement and what you are trying to build.