Using createPortal in functionalComponent of Kotlin-react

Does anyone have some idea how to use createPortal in kotlin-react for example to render a modal? i have tried several ways and nothing is working. I´m new at Kotlin. Here is one way i tryed:

interface Modalprops:RProps{
var visible:Boolean
}

val modal = functionalComponent<Modalprops> {props->
val (container) = useState(document.create.div{+"asdasdsa"})
useEffectWithCleanup(emptyList()) {
document.body?.appendChild(container)
return@useEffectWithCleanup { document.body?.removeChild(container)}
}
createPortal(container){
if(props.visible) {
div { +"asdasd" }
}
}
}
fun RBuilder.OModal(isvisible:Boolean, handler:Modalprops.()->Unit) = child(modal){
attrs{
visible=isvisible
}
}

its just how its working in good old TS and i tried to transfer it to kotlin-react but createPortal seems to do nothing in this case.

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It would be nice if some could give me an example of how implement this example correct in react-kotlin.