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Need to provide support to excel export the custom aggregate in Blazor treegrid

In Blazor TreeGrid, custom aggregates defined using AggregateType.Custom are rendered correctly in the UI but are not exported to Excel by default, as the TreeGrid currently lacks built-in support for exporting custom aggregate rows. To overcome this limitation and ensure custom totals or summaries appear in the Excel file, developers must manually inject footer rows using the ExcelExportProperties.Footer property during export. This allows precise control over the content and styling of exported footer rows, enabling the inclusion of custom aggregate values such as totals, counts, or formatted summaries. Optionally, the ExcelQueryCellInfo event can be used to suppress unwanted default aggregate labels like "Custom:" and ensure a clean export output.