mihon/app/src/main/res/layout/extension_card_header.xml

<?xml version="1.0" encoding="utf-8"?>
<FrameLayout
    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"
    android:layout_width="match_parent"
    android:layout_height="wrap_content">

    <androidx.constraintlayout.widget.ConstraintLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent">

        <TextView
            android:id="@+id/title"
            style="@style/TextAppearance.Regular.SubHeading"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:paddingBottom="8dp"
            android:paddingLeft="@dimen/material_component_text_fields_padding_above_and_below_label"
            android:paddingTop="8dp"
            tools:text="Title"/>

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