Unfortunately, In MVP I still implement traditional way like this:

Activity {
  recyclerView.adapter = adapter
  adapter.setItemOnClickListener { position ->
    presenter.onItemClick(position)
  }
}
Presenter {
  onItemClick(position:Int) {
    val item = list.get(position)
    // do something
  }
}

If you implement MVVM with Databinding. You can implement it in XML layout

// layout.xml
<RecyclerView
  recycler:datas="@{viewModel.datas}"
  recycler:onItemClick="@{viewModel.onItemClicked}"
/>
// Bindingadapter.kt
@BindingAdapter("datas")
fun adapterDatas(view:RecyclerView, datas:List<Data>) {
  view.adapter.updateDatas(datas)
}
@bindingAdapter("onItemClick")
fun adapterOnItemClick(view:RecyclerView, click:(Int, Item) -> Unit) {
  view.adapter.itemClick = click
}
// ViewModel.kt
ViewModel {
  val datas = ObservableField<Data>()
  @Bindable
  fun getOnItemClick() : (Int, Item) -> Unit) {
    return {position, item -> /* do something */}}
}
// Adapter.kt
Adapter {
  var itemClick : ((Int, Item) -> Unit)? = null
  fun onBindViewHolder(holder, position) {
    holder.itemView.setOnItemClick { itemClick?.invoke(position, datas[position]) 
  }
}

I hope it would be helpful