How to attach Kotlin sources of multiplatform dependencies to IDEA?

Question

I'm used to the automatic source code attachment functionality that worked for a very long time, but now I've observed that more and more libraries (including kotlinx packages) don't come with sources. How can I instruct IDEA to attach them automatically? If it can't be done is there a workaround?

For example if I Ctrl+Click on Channel, then IDEA opens a file called Channel.kotlin_metadata with this content:

public interface Channel<E> : kotlinx.coroutines.channels.SendChannel<E>, kotlinx.coroutines.channels.ReceiveChannel<E> {
    public companion object Factory {
        public const final val BUFFERED: kotlin.Int /* compiled code */
        internal final val CHANNEL_DEFAULT_CAPACITY: kotlin.Int /* compiled code */
        public const final val CONFLATED: kotlin.Int /* compiled code */
        public const final val DEFAULT_BUFFER_PROPERTY_NAME: kotlin.String /* compiled code */
        internal const final val OPTIONAL_CHANNEL: kotlin.Int /* compiled code */
        public const final val RENDEZVOUS: kotlin.Int /* compiled code */
        public const final val UNLIMITED: kotlin.Int /* compiled code */
    }
}