title: Show dynamically-populated popup text when user hovers over spreadsheet cell
body: <p>I have a Google Spreadsheet with a row that counts number from 1, 2, 3, etc. Each number stands for a certain kind of message (goal). These messages (goals) are in a different sheet and have text values.</p>
  
  <p>Using a Google Apps Script, is it possible to make it so that if a user hovers over, for example, 1, they are shown the message that belongs to that value? I know that this is possible with notes, but that's not dynamic and not exactly what I mean.</p>
  
  <p>I hope that someone has an idea on how to handle this.</p>
  
  <p><img src="https://i.stack.imgur.com/XNEi2.png" alt="enter image description here"></p>