Ion-textarea zoom in when focused

Simple ionic 2 app with multiple ion-textarea on same page.

Testing on iPhone 6.

I want the app to zoom in on the ion-textarea when it is selected and then zoom back out when the keyboard is closed.
(similar behavior to a textarea on a webpage in the phone’s browser).

Have tried wrapping everything in an ion-scroll:

"ion-scroll direction=‘xy’ max-zoom=‘5’ maxZoom=‘5’ zoom=‘true’ zooming=‘true’ scrollX=‘false’ scrollY=‘false’ scrollbar-x=‘false’ scrollbar-y=‘false’ style=‘height: 100%; width: 100%;’ overflow-scroll=‘false’ "

ion-scroll does not work (and does not even enable pinch-to-zoom which is another bug).