Is it possible to hide Specific Columns in the aggregates row of DataGrid?

[Shiti]

I'm using the javascript perspective-viewer. There are some columns I wish to hide such as Date, etc in rows where the group aggregates such as totals are shown.

For example, for the Sales Data example, when grouping by Country, Region and Order Date, I do not want to see RowId and OrderId for the row with the Total.

I want to be able to show different columns for the aggregates and the actual row. Is there a setting/configuration to do so ?