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No, if you are targeting a different platform you can't use JVM libraries.

If your target is JavaScript, you can use JavaScript dependencies (sort of: they won't have any type bindings so you will need to code then yourself) but you can't use any JVM libraries on it.

As other said, yep, you do not get the Java ecosystem if your target is native executables (or JS). there are alternatives like kotlinx-datetime, kotlinx-serialization, the kotlin stdlib. However, if you know you're going to stay on a JVMable target, feel free to not use Kotlin/Multiplatform, but regular JVM Kotlin libraries

No, if you use Kotlin native you do not get access to Java libs.