Question: Will this packages support `extension types` like `kotlinx.serialization`?

Kotlin's JSON serialization library(`kotlinx.serialization`) supports the value class in the following way:

Code:
```kotlin
@Serializable
@JvmInline
value class Color(val rgb: Int)

@Serializable
data class NamedColor(val color: Color, val name: String)

fun main() {
println(Json.encodeToString(NamedColor(Color(0), "black")))
}
```
Json:
```JSON
{"color": 0, "name": "black"}
```

I'm wondering if this package will support Json serialization in a similar way to Kotlin.