How to use DataBindings with RxJava?

I am trying to combine dataBinding with RxJava so that it looks something like that:

layout.xml:

<android.support.constraint.ConstraintLayout
        //...
        app:rxClick="@{viewModel.onTap}">
    <TextView
            //...
            android:text="@{viewModel.title}"
    </TextView>
    //...

ViewModel:

class ViewModel {
    val title = PublishSubject.create<String>()
    val onTap = PublishSubject.create<Void>()
    //...
}

But I cannot find an easy way to make it like that.

One of the things I found while researching is ObservableField and LiveData which is included in the dataBinding library. And I do not think it is a good solution because rxJava is much more sophisticated and ObservableField does not seem to be compatible with rxJava.

Another thing I found is this library https://github.com/ArthurVimond/RxBindingAdapters which kind of suits the case. But it does not work, failing with the error while compiling:

e: [kapt] An exception occurred: android.databinding.tool.util.LoggedErrorException: Found data binding errors.
****/ data binding error ****msg:cannot find type element for io.reactivex.subjects.Subject

Is there another option I missed? Any suggestions?