We just implemented support for using Compose for Desktop in IntelliJ IDEA plugins. Take a look at https://github.com/JetBrains/compose-jb/tree/master/examples/intelliJPlugin.

Is it something that already can be used to build plugins?

sure, try it

AFAIK Compose Desktop requires Java 11, however Android Studio is bundled with Java 1.8. So I suppose this won't work well in production?

This is really interesting. I’d love to see someone try and copy paste whatever they do 😛