FWIW I've been working on a native Swift implementation of Flutter channels [1], so I can use Swift for business logic with Sony's embedded Flutter embedder [2]. Probably a niche interest, but I'd prefer to write Swift than Dart, and there's no Objective-C runtime on Linux (so I can't use the default Darwin embedder).

[1] https://github.com/PADL/FlutterSwift

[2] https://github.com/sony/flutter-elinux