The AgGrid documentation for Grouping Footers, mentions there is a way to customize the rendering of the grouped row using groupInnerCellRenderer, but its not clear if this prop needs to be added to the gridOptions or to cellRendererParams for agGroupCellRenderer, see the excerpt below:
When showing the groups in one column, the aggregation data is displayed in the group header when collapsed and only in the footer when expanded (ie it moves from the header to the footer). To have different rendering, provide a custom groupInnerCellRenderer, where the renderer can check if it's a header or footer.
I was wondering if someone could post an example of agGrid that uses groupInnerCellRenderer.