I think you may want to look at Nitro Modules:
Direct Swift <> C++ interop
Unlike Turbo- or Expo-Modules, Nitro-Modules does not use Objective-C at > all. Nitro is built using the new Swift <> C++ interop, which is close to > zero-overhead.
Right now it doesn't easily support Fabric for View Components but if it's just for a Turbo Module alternative, it seems the easiest way to connect to swift right now.