title: Insert a Checkbox into every cell and assign it to that cell
body: <p>I need to add a checkbox to every cell which is linked to that cell.  When checked it will return true, when unchecked it returns false into the cell it is assigned to.</p>
  
  <p>The worksheet has thousands of cells, and as I'm going through inserting them manually, I realize there has to be a better solution.</p>
  
  <p>The sheet I am working on looks like this:<br>
  <a href="https://i.imgur.com/wbFXK.jpg" rel="nofollow noreferrer"><img src="https://i.imgur.com/wbFXK.jpg" alt="enter image description here"></a></p>