Unfortunately we don’t support CompositeAnnotation API for mobile(iOS and Android), because it’s complex API which is hard to implement and there was no interest in it from our customers. You can create feature request to implement CompositeAnnotation API and if it gets enough votes we’ll implement it.
Also you can achieve similar effect by combining existing annotations in your app or by creating custom annotation. You can implement custom drawing for it from scratch (all annotations are Views so you can customize them like any other Android Views)
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