Integrating Xamarin Code

I have been tasked with integrating code from a Xamarin application into an Ionic 3 based application.

From my understanding Xamarin is written in C#, with a native UI for each platform you wish to deploy against.

The intention is to integrate the existing Xamarin code (or exported library) in some way into the Ionic application.

Does anybody know if this is a complete dead end, or whether there is some way in which this can be achieved ?

Dead end.

They’re fundamentally different beasts.