ItemViewModel.kt

interface ItemViewModel {
    ...
    val bindableProperties: Map<Int, Any>
}

class CarAdViewModel(val make: String, val model: String, val price: String) : ItemViewModel {
    ...
    override val bindableProperties: Map<Int, Any> = mapOf(
        BR.make to make,
        BR.model to model
    )
}

class BindableViewHolder(private val binding: ViewDataBinding) : RecyclerView.ViewHolder(binding.root) {

    fun bind(itemViewModel: ItemViewModel) {
        itemViewModel.bindableProperties.entries.forEach {
            binding.setVariable(it.key, it.value)
        }
    }
}