Hi,
Actually we have made Custom Summary Item for displaying helper text. But we are facing one issue we are displaying helper text in a summary row but that text got truncated from last (i.e. last few characters are missing when displayed).Please have look on below image to have good understanding of issue.
I am providing you the code which we have used. If you need any more information. Please let me know

Code:

Method to set summary row text

 private void SetHelpText(string strHelpText)
        {
            if (this.SummaryRowsTop.Count == 0)
            {
                CustomSummaryStatusItem summaryItem = new CustomSummaryStatusItem(this.MasterTemplate.Columns[0].Name, strHelpText + "", GridAggregateFunction.Count);
                GridViewSummaryRowItem summaryRowItem = new GridViewSummaryRowItem();
                // Used to set cell value in GrdData_ViewCellFormatting
                summaryItem.Name = "StatusText|" + strHelpText;

                summaryRowItem.Add(summaryItem);
                this.SummaryRowsTop.Add(summaryRowItem);
            }
            else
            {
                var summaryRowTop = this.SummaryRowsTop[0];
                var summaryItem = summaryRowTop[0] as GridViewSummaryItem;
                summaryItem.Name = "StatusText|" + strHelpText;
            }

            var summaryRowIndex = this.MasterView.SummaryRows.IndexOf(this.SummaryRowsTop[0]);
            this.MasterView.SummaryRows[summaryRowIndex].PinPosition = PinnedRowPosition.Top;
            this.MasterView.SummaryRows[summaryRowIndex].IsVisible = true;

            this.MasterView.SummaryRows[0].PinPosition = PinnedRowPosition.Bottom;
            this.MasterTemplate.BottomPinnedRowsMode = GridViewBottomPinnedRowsMode.Fixed;
        }

Custom Summary Item:

public class CustomSummaryStatusItem : GridViewSummaryItem
    {
        public CustomSummaryStatusItem(string name, string formatString, GridAggregateFunction aggregate)
        : base(name, formatString, aggregate)
        { }
        public override object Evaluate(IHierarchicalRow row)
        {
            return 1;
        }
    }

Below Attached Image will help you to know more about issue. Please have a look on them.
Actual Text Dispalyed

Expected Text To Display
Thanks,
Shubham Jain

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