Create custom Tabbar in Xamarin Forms using NaviagtionPages & Buttons added inside a ContentPage

I want to create custom Tabbar in Xamarin Forms using NaviagtionPages & Buttons added inside a ContentPage. I do not want to use the default Tabbed Page because the UI shows up differently for Android and iOS with it (tabbar at top on android vs tabbar at bottom for iOS). Hence, I was creating a common component using Xamarin forms. I have created a similar custom tabbar in iOS (by adding Navigation controllers as child controllers along with buttons in a View controller).

So far I have added Buttons and ContentPages(by ContentPage.Content) inside a ContentPage. I toggle the visibility of the content pages on tapped events of the buttons.

But I want to replace the ContentPages by NavigationPages so that each tab(button) can have its own stack of ContentPages.

Unfortunately, I cannot figure out how to add NavigationPage inside a content view to make this work.