Can I program microcontrollers in Kotlin?

Situation was changed with the new player on the scene named Kotlin/native. Due to the support of LLVM, I think it is possible to compile to native from Kotlin to the desired devices.

Yes. Microcontrollers are still computers. if python can be used in Raspberry. then Kotlin can also be used.

First you need compile, JVM(Open source e.g OpenJDK) with that microcontroller toolchain. Then run the image in the microcontroller. Now create a kotlin file, compile it and run it with that JVM. Thats if the microcontroller runs on a kernel e.g linux

Make sure that microcontroller have enough memory.