serialize with kotlinx from superclass

gistfile1.txt

//Parent
@Serializable
abstract class KlutterJSON<T>(
    private val serializer: SerializationStrategy<T>,
){

    //todo need reference to child class body to serialize it
    fun toKJson() = Json.encodeToString(serializer, ????)

    //Doesnt work obviously:
    //fun toKJson() = Json.encodeToString(serializer, this)
}

//Child
@Serializable
class Foo(val bar: String): KlutterJSON<Foo>(serializer())


@Test
fun shouldTest() {

    assertEquals("""{"bar":"boo"}""", Foo(bar = "boo").toKJson())

}