Display excel sheet from right to left after exporting html table

Below is my Java script code to export my table result into excel file format but I need the header font be bold and also the page displays from right to left in excel file, since the language is Arabic.

<script>

        function ExportToExcel(type, fn, dl) {
            var elt = document.getElementById('tblexp');
            var wb = XLSX.utils.table_to_book(elt, { sheet: "sheet1" });
            return dl ?
                XLSX.write(wb, { bookType: type, bookSST: true, type: 'base64' }) :
                XLSX.writeFile(wb, fn || ('MySheetName.' + (type || 'xlsx')));
        }

    </script>

<div class="input-group"><button class=" btn btn-secondary" onclick="ExportToExcel('xlsx')">Export table to excel</button></div>