Is it possible to add TextView below RadioButton in RadioGroup in any other way than extending and creating my custom RadioButton?
Yes, its possible. See below:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent">
    <RadioGroup
        android:layout_width="fill_parent"
        android:layout_height="wrap_content" >
        <RadioButton
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="btn1" />
        <RadioButton
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="btn2" />
        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="sample text" />
    </RadioGroup>
</LinearLayout>
Sample output:

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