At least when I tried with CLion, it wasn't possible to get it to support both Rust and Kotlin simultaneously. You can get both in IntelliJ with the Rust plugin, but it didn't work well when I attempted it. I have to use both Rust and Kotlin in the same project at work every day, so I end up switching between IntelliJ and VSCode constantly. Worse, it's a multi-workspace project, so I even have to use several VSCode windows and switch between them, or rust-analyzer refuses to work. It's so easy to get lost in the sea of identical looking code windows. Not ideal 😔