title: How can I add title and blank rows before table while exporting to excel from angularjs?
body: <p>I want to export data from table into excel file, but I want to add title and few blank rows before table. Also I want to do some css for that table.</p>
  <p>This is my code in .ts file and it works but I want to style it a little bit.  I didn't find anything for my problem, but also I'm beginner in this :)</p>
  <p>exportExcel() : void {
  const ws: XLSX.WorkSheet =XLSX.utils.json_to_sheet(this.excelArray);</p>
  <pre><code>/* generate workbook and add the worksheet */
  const wb: XLSX.WorkBook = XLSX.utils.book_new();
  XLSX.utils.book_append_sheet(wb, ws, 'Sheet1');
  
  /* save to file */  
  XLSX.writeFile(wb, this.fileName);
  </code></pre>
  <p>}</p>