my_custom_font_family.xml

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

    <!-- Regular -->
    <font
        app:font="@font/my_custom_font_regular"
        app:fontStyle="normal"
        app:fontWeight="400" />
    
    <!-- Italic -->
    <font
        app:font="@font/my_custom_font_italic"
        app:fontStyle="italic"
        app:fontWeight="400" />

    <!-- Bold -->
    <font
        app:font="@font/my_custom_font_bold"
        app:fontStyle="normal"
        app:fontWeight="700" />

</font-family>