How can I implement push notification in Xamarin forms

I am going to implement push notification for my Xamarin Forms project targeting IOS, Android and UWP.

Is there any Nuget Package available for this feature? Or this feature requires platform-specific implementation? And is push notification works on UWP?

What is Azure Notification Hubs? Is that necessary to implement push notification in xamarin forums?

I found a blog about this feature here, but in that the notifications are sending from Azure portal. My project was a chat application and the push notification should come when a new message sends.

Any help would be greatly appreciated. Sample codes or tutorial references are welcome.