tempus/app/src/main/res/font/open_sans_font_family.xml

<?xml version="1.0" encoding="utf-8"?>
<font-family
    xmlns:app="http://schemas.android.com/apk/res-auto">
    <font app:font="@font/regular" app:fontStyle="normal" app:fontWeight="400" />
    <font app:font="@font/bold" app:fontStyle="normal" app:fontWeight="700" />
    <font app:font="@font/extra_bold" app:fontStyle="normal" app:fontWeight="900" />
</font-family>