layout に WebView を追加

main_fragment.xml

<?xml version="1.0" encoding="utf-8"?>
<layout
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools">

    <!-- add -->
    <data>
        <variable
            name="webviewmodel"
            type="com.example.webscrapingtest.viewmodel.MainViewModel"/>
    </data>

    <androidx.constraintlayout.widget.ConstraintLayout
        android:id="@+id/main"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        tools:context=".view.MainFragment">

        <!-- add -->
        <WebView
            android:id="@+id/webView"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:layout_weight="1" />

    </androidx.constraintlayout.widget.ConstraintLayout>
</layout>