Cargokit
Please refer to its documentation for how to use it. Its GitHub repository is https://github.com/irondash/cargokit. In addition, it has a companion blog about how to integrate it at https://matejknopp.com/post/flutter_plugin_in_rust_with_no_prebuilt_binaries/.
It seems that, after Dart native assets is stablized, cargokit will also utilize it.