title: Padding or margin for UILabels in UIStackView
body: <p>I want to add margins or paddings on the right of some nested UILabels</p>
  
  <p><a href="https://i.stack.imgur.com/IH0uv.png" rel="noreferrer"><img src="https://i.stack.imgur.com/IH0uv.png" alt="View hierarchy"></a></p>
  
  <p>like shown here: </p>
  
  <p><a href="https://i.stack.imgur.com/uWEjG.png" rel="noreferrer"><img src="https://i.stack.imgur.com/uWEjG.png" alt="Target layout"></a></p>
  
  <p>Using trailing spaces on the labels seems wrong and old-school somehow. </p>
  
  <p>Any way to make that more elegant on interface builder?</p>