Tutorial:

• Download this Shortcut
• Create a different Shortcut and add Kotlin API to your Shortcut by adding Run Shortcut
• Add your code inside main ex:
  fun main() {
      println("Hello, Kotlin!")
  }
• Pass the code above to Kotlin API
• Kotlin API will return the stdout as String
• Here's an exmaple

Credits:

Dirtannik: the creator of this shortcut Twitter, RoutineHub, Reddit

JetBrains: here's some Kotlin examples