How to make a squared image to a round image on xamarin forms ?

Is it possible to make a round image on Xamarin Forms of a squared image. I have a lot of images which should be displayed as a circle on ListView along with its name etc. But how can I do this?

<Ellipse.Fill>

</Ellipse.Fill>

I tried like this, but it is not working and it threw an error "Type ImageBrush not found in xmlns http://xamarin.com/schemas/2014/forms"