title: How to create static worksheet XLSX
body: <p>I want to create XLSX, but I want to create empty XLSX, it means that I won't pass there any json but static values.
  So, I want to add to cell A1 string "Example 1", cell B8 "This is cell cell B8", to cell F4321 string "WOW" etc. </p>
  
  <p>My problem is:</p>
  
  <pre><code>  const worksheet: XLSX.WorkSheet = XLSX.utils.json_to_sheet(this.reportPayment,
      {  });
  </code></pre>
  
  <p>and when I use:</p>
  
  <pre><code> worksheet['A1'].v = 'This is cell A1';
  </code></pre>
  
  <p>I get the error:</p>
  
  <blockquote>
    <p>Cannot convert undefined or null to object</p>
  </blockquote>
  
  <p>I think problem is in this first part.</p>