Setting title in excelhtml5

y060121

How to setup a title in excelhtml5 export, title is working correctly in pdfhtml5 export, but not working in excelhtml5, any help here pls. My code below,
thank you.

   $(document).ready(function() {
   $('#export').DataTable( {

    dom: 'Bfrtip',      
    buttons: [            
         {
            extend: 'excelHtml5',
            title: 'Report'
         },
        {
            extend: 'pdfHtml5',
            title: 'export'
        },
        {
            extend:'print'              
        }

    ]
} );
} );