Using Export to Excel Improvements for Table and Matrix Visuals at 1.12.7981.11681 Version Sep. Upd

If you are talking about these improvements https://powerbi.microsoft.com/en-us/blog/export-to-excel-improvements-for-table-and-matrix-visuals-preview/ then no, you cannot use these in Report Server yet since they were released later than the most recent Report Server version. Hopefully these will make it into the January 2022 release of Report Server.