Animate growth of ScrollView which is expanding from the bottom of the page?

We've got a ScrollView which I've set with a VerticalOptions of "End", so that when we add content to it at runtime it 'grows' from the bottom.

We're scrolling to the end when adding content, with animation. This looks good when the ScrollView is full and is actually scrolling.

However, when content is added to the ScrollView, the new content appears immediately with no animation.

Any thoughts on how to animate the growth of the ScrollView as the new content is added? Ideally I'd like it to slide up, like the animated scroll when it's full.

We're using a RepeaterView as the content of the ScrollView, if that's relevant.