How to make MutableLiveData declaration unnecessary in ViewModel.

LiveDataEditor.kt

package com.example.android.livedata

import androidx.lifecycle.LiveData
import androidx.lifecycle.MutableLiveData
import kotlin.properties.ReadOnlyProperty
import kotlin.reflect.KProperty

abstract class LiveDataEditor<R> {

    fun <T> propertyOf() = LiveDataProperty<T>()

    inner class LiveDataProperty<T> : ReadOnlyProperty<R, LiveData<T>> {
        private val liveData = MutableLiveData<T>()

        override fun getValue(thisRef: R, property: KProperty<*>): LiveData<T> = liveData

        fun setValue(value: T?) {
            liveData.value = value
        }

        fun postValue(value: T?) {
            liveData.postValue(value)
        }
    }
}

SampleViewModel.kt

package com.example.android.livedata

import android.os.CountDownTimer
import android.text.format.DateUtils
import android.util.Log
import androidx.lifecycle.LiveData
import androidx.lifecycle.Transformations
import androidx.lifecycle.ViewModel
import com.example.android.livedata.LiveDataEditor

class SampleViewModel : ViewModel() {

    private val editor = object : LiveDataEditor<SampleViewModel>() {
        val word = propertyOf<String>()
        val score = propertyOf<Int>()
    }

    val word by editor.word // without databinding

    val score: LiveData<Int> by editor.score // with databinding
}