[Ionic V4] how do you put text under icon in ionicV4? Button

How do you put text under icon without extra wrapper in ionic V4?
Before Ionic v4, it’s very easy to do that, but I have no idea to accomplish such kind of easy thing in Ionic v4.
Plz help ~

      <ion-button>
        <ion-icon name="add"></ion-icon>
        <span>Add</span>
      </ion-button>

Shouldn’t flexible be the first thing a component library should consider?

any opinions are welcomed