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You might want to dive into <https://github.com/Kotlin/kotlinx.serialization/blob/master/docs/polymorphism.md>. I'm not sure you can serialize `List&lt;Any&gt;` but you could serialize `List&lt;BaseType&gt;` where `BaseType` is a super type for all your list elements.

Another option is to work with `JsonElement` then you can construct your `JsonElement` at runtime without having to worry about types

I need to serialize to nesting list, something like `[1, [2, 3], 4]` .

You can do something like this:
```  JsonArray(
      listOf(
          JsonPrimitive(1),
          JsonArray(
              listOf(
                  JsonPrimitive(2),
                  JsonPrimitive(3),
              )
          ),
          JsonPrimitive(4),
      )
  ).toString()```
It's verbose but it'll work