Content replace transition for SwiftUI?

In session wwdc2023-10194 Design dynamic Live Activities at 04:53, it mentioned that we should use 'content replace transition' for animating in and out graphic elements and text.

The video shows some kind of animation combined with blurring and opacity changes.

But I can't seem to find code for doing this in SwiftUI or UIKit. Does anyone know the API to achieve this? 🤔

Thank you for your help!