The Swift SDK for Android doesn't specify or mandate any user-interface technology, but leaves it open for other projects to build upon. For example, Skip.tools re-implements SwiftUI for Android by bridging it to Jetpack Compose, so you can use the same codebase for both your business logic as well as UI layer.
[Disclaimer: I work on the Skip product, and I am also a founding member of the Swift Android Workgroup and am the release manager for the Swift SDK for Android]
We write about it at https://skip.tools/blog/fully-native-android-swift-apps/ and an example of an app on the Play Store that demonstrates this is the Skip Showcase app: https://skip.tools/docs/samples/skipapp-showcase-fuse/
[Disclaimer: I work on the Skip product, and I am also a founding member of the Swift Android Workgroup and am the release manager for the Swift SDK for Android]