Can someone tell me the idea behind

compose compiler

running on K/N?? We can expect composables in KMP world?

While you cannot use the compose UI toolkit on native, you could use the compose compiler to build other composable code. I'm surprised it works. It might not actually work and the plugin just is not disabling it on native.

Compose is already multiplatform, and there are some UI implementations as well. Ther is Compose for Desktop, which is quite good already. Also there is Compose for Web, which manipulates DOM. The Compose compiler recently got Native support, which opened doors for native implementations.

This is interesting project as well: https://github.com/cl3m/multiplatform-compose