We had same problem with multi language app that is on all platforms (android, iOS, desktop and web) so we came up with building gradle plugin for it.
It uses the defined strings.xml from different folders in the composeResources folder to generate languages along with global state for the current language and helper functions to list all languages in the app or find it with the language code.
You can check out our repository readme for more details of using plugin and see if it satisfying your needs.

https://github.com/hyperether/compose-multiplatform-localize