audaine

As the previous commentor said, Next.js or React Native + Expo may be a better option. There's also the options of AssemblyScript + React/Next.js, or NativeScript and Ionic, both of which give you mature ecosystems of tools and close-to-native experiences. Flutter, you're likely to have the same experiences you had with Swift and Kotlin. Flutter requires higher separation of concerns between platforms, doesn't have nearly the third-party support of any of the other options, and is fairly large in binary size. Still, it's a growing system and in the future it may actually outcompete the other options when it has a large enough ecosystem.