CollectionView Custom Render iOS Masonry Style

Hi, I'm trying to do a Custom Render for a CollectionView in Xamarin Form for the iOS project, but I haven't found a way to do it, I'm trying that my collectionview looks like Masonry Style, I did it in Android.

Some of the question I found give a microsoft link for WaterfallCollectionLayout, but the thing is what they explain there is just for Xamarin iOS not for cross platforms project, could you give a code example of how to do it?

This is how it looks like in Android