Animation in Xamarin Forms ListView

I have one requirement where I need to create a vertical List with Once Box in Center. Once Users scrolls the list, the element which enters the box should show animation like growing Font while entering the box, and smaller Font while leaving the Box.

Please refer the image attached.

I am trying with a ListView for Vertical Scroll and a frame For the centre box.

How Can I achieve animation like this in Xamarin Forms. Please guide me some ways .