title: Add date for 'Last updated' in dashboard
body: <p>I have a dashboard, with a text area where I want a date reflecting last update. </p>
  
  <p>I have a date column in my data-set which could do it as this has 'last modified dates'</p>
  
  <p>Can I insert a 'label'/dynamic value which returns the max date in that column?</p>
  
  <p>Like this: 
  This dashboard was last updated: MAX(last modified column)</p>