https://www.syncfusion.com/feedback/3280/celltemplate-support-for-gridsummarycolumn-similar-to-gridtextcolumn
CellTemplate support for GridSummaryColumn similar to GridTextColumn in WPF | Feedback Portal
Check out the feature request in WPF - SfDataGrid - CellTemplate support for GridSummaryColumn similar to GridTextColumn.
support forsimilar