title: MultipleLines custom field in VSO does not appear in Power BI report's dataset
body: <p>I referred the <a href="https://www.visualstudio.com/en-us/docs/report/analytics/access-analytics-power-bi" rel="nofollow noreferrer">Link</a> to import the data from my VSO into a Power BI report.
  I'm able to view all the Fields data related to a Work item (ex: title, assigned to, state) in 'WorkItems' table.
  I'm also able to view the Custom fields data as shown below:<br><br>
  <a href="https://i.stack.imgur.com/ZIWzL.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/ZIWzL.png" alt="Custom Fields - in report"></a>
  <br>All the above custom fields in VSO are of type, text(single line), drop down, date etc.</p>
  
  <p>But, i'm unable to find all those custom fields, which are of type "Text (multiple lines)", the fields in VSO which are rich text editors/html type.<br>
  <a href="https://i.stack.imgur.com/Q99yo.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/Q99yo.png" alt="enter image description here"></a>
  <br>How can i get those field values ? Is it not currently supported ?</p>