Here’s a controller to add dynamic summaries to XAF Blazor ListViews until DevExpress includes them in the context menu for the footer.

public class SummaryController : ViewController<ListView>
{
    SingleChoiceAction summaryAction;

    public SummaryController()
    {           
        summaryAction = new SingleChoiceAction(this, "summaryAction", PredefinedCategory.Edit);
        summaryAction.Caption = "Summary";
        summaryAction.ItemType = SingleChoiceActionItemType.ItemIsOperation;
        summaryAction.Execute += SummaryAction_Execute;
    }
    protected override void OnActivated()
    {
        base.OnActivated();
      
        summaryAction.Items.Clear();
        var typ = ((TypeInfo)View.ObjectTypeInfo).Type;
        var properties = typ.GetProperties();
        foreach (var prop in properties)
        {
            if (prop.Name == "Oid" | prop.Name == "This" | prop.Name == "Loading" | prop.Name == "ClassInfo" | prop.Name == "Session" | prop.Name == "IsLoading" | prop.Name == "IsDeleted") continue;
            var setPropiedadSummary = new ChoiceActionItem(typ.Name, prop.Name, null);
            summaryAction.Items.Add(setPropiedadSummary);
            AddSummary(setPropiedadSummary, typeof(GridSummaryItemType));
        }
        summaryAction.Items.Add(new ChoiceActionItem("Remove", "Remove", null));
    }
    void AddSummary(ChoiceActionItem parentItem, Type enumType)
    {
        EnumDescriptor ed = new EnumDescriptor(enumType);
        foreach (object current in ed.Values)
        {
            if(current.ToString() == "Custom" || current.ToString() == "None") { continue; }
            ChoiceActionItem item = new ChoiceActionItem(current.ToString(), current);
            parentItem.Items.Add(item);
        }
    }
    private void SummaryAction_Execute(object sender, SingleChoiceActionExecuteEventArgs e)
    {
        if (View.Editor is DxGridListEditor editor)
        {
            if (e.SelectedChoiceActionItem.Caption == "Remove")
            {
                editor.GridSummary.TotalSummary.Clear();
            }
            else
            {
                DxGridSummaryItemWrapper summary = new DxGridSummaryItemWrapper(new DxGridSummaryItemModel
                { 
                    SummaryType = (GridSummaryItemType)e.SelectedChoiceActionItem.Data,
                    FieldName = e.SelectedChoiceActionItem.ParentItem.Caption,
                    FooterColumnName = e.SelectedChoiceActionItem.ParentItem.Caption
                });

                if (!editor.GridSummary.TotalSummary.Any(s => s.SummaryType == ConvertSummaryItemType((GridSummaryItemType)e.SelectedChoiceActionItem.Data) & s.FieldName == e.SelectedChoiceActionItem.ParentItem.Caption))
                {
                    editor.GridSummary.TotalSummary.Add(summary);
                }
            }
            RefreshController refreshController = Frame.GetController<RefreshController>();
            if (refreshController != null)
            {
                refreshController.RefreshAction.DoExecute();
            }
        }
    }
    private DevExpress.Data.SummaryItemType ConvertSummaryItemType(GridSummaryItemType summaryItemType)
    {
        return summaryItemType switch
        {
            GridSummaryItemType.Sum => DevExpress.Data.SummaryItemType.Sum,
            GridSummaryItemType.Min => DevExpress.Data.SummaryItemType.Min,
            GridSummaryItemType.Max => DevExpress.Data.SummaryItemType.Max,
            GridSummaryItemType.Count => DevExpress.Data.SummaryItemType.Count,
            GridSummaryItemType.Avg => DevExpress.Data.SummaryItemType.Average,
            GridSummaryItemType.Custom => DevExpress.Data.SummaryItemType.Custom,
            _ => DevExpress.Data.SummaryItemType.None
        };
    }

 
    protected override void OnViewControlsCreated()
    {
        base.OnViewControlsCreated();
        // Access and customize the target View control.
    }
    protected override void OnDeactivated()
    {
        // Unsubscribe from previously subscribed events and release other references and resources.
        base.OnDeactivated();
    }
}

Video: