Possibility to render stateful widget inside popup

[kxxt]

I want to render a stateful widget(The built-in widget list). But it appears that I can't pass the state through tui-popup.

Would it be possible to design an API to allow state to be passed through tui-popup to a inner stateful widget? Or should we change the API to make popup work more like a Block so that users could manually render whatever they want inside it?