title: Excel::Writer::XLSX - Data Label "Value From Cells" option
body: <p>I'm using Excel 2013 and within "Format Data Labels" there is a "Value From Cells" option that lets me select any cells to use as labels.</p>
  
  <p>I've looked at options in chart <code>-&gt; add_series -&gt; data_labels</code> and don't seem to see it there. So I'm wondering if there is some way I can use custom labels?</p>
  
  <p><a href="https://i.stack.imgur.com/CNWXX.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/CNWXX.png" alt="Screenshot of Excel 2013"></a></p>
  
  <p>As you can see in the image, there is a "Format Data Labels..." and when selected, you can see "Value From Cells" on the right hand side, with "Select Range..." as an option.</p>