title: Angular Material 2 - Display mat-tab-label text in two lines (like title an subtitle)
body: <p>I'd like to display text in mat-tab-label like some title and its subtitle. For example as on <a href="https://material.angular.io/components/card/examples" rel="nofollow noreferrer">mat-card-header</a> where the title and subtitle can be set and displayed one under the other.</p>
  <p>Is it possible to make text in mat-label be displayed like in this screenshot?
  <a href="https://i.stack.imgur.com/d0YU4.jpg" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/d0YU4.jpg" alt="enter image description here" /></a></p>
  <p>Here is the <a href="https://stackblitz.com/edit/angular-tabs-with-2-line-label?file=src%2Fapp%2Fapp.component.html" rel="nofollow noreferrer">stackbliz</a> that I tried, but nothing works - all the tags always display inline.</p>