prebuilt/etc/fonts_customization.xml

<?xml version="1.0" encoding="utf-8"?>
<fonts-modification>
    <family name="lato" customizationType="new-named-family">
        <font weight="400" style="normal">Lato-Regular.ttf</font>
        <font weight="400" style="italic">Lato-Italic.ttf</font>
        <font weight="500" style="normal">Lato-Medium.ttf</font>
        <font weight="500" style="italic">Lato-MediumItalic.ttf</font>
        <font weight="700" style="normal">Lato-Bold.ttf</font>
        <font weight="700" style="italic">Lato-BoldItalic.ttf</font>
    </family>
    <alias name="lato-semi-bold" to="lato" weight="500" />
    <alias name="lato-bold" to="lato" weight="700" />
    <family name="muli" customizationType="new-named-family">
        <font weight="400" style="normal">Muli-Regular.ttf</font>
        <font weight="400" style="italic">Muli-Italic.ttf</font>
        <font weight="500" style="normal">Muli-Medium.ttf</font>
        <font weight="500" style="italic">Muli-MediumItalic.ttf</font>
        <font weight="600" style="normal">Muli-SemiBold.ttf</font>
        <font weight="600" style="italic">Muli-SemiBoldItalic.ttf</font>
        <font weight="700" style="normal">Muli-Bold.ttf</font>
        <font weight="700" style="italic">Muli-BoldItalic.ttf</font>
    </family>
    <alias name="muli-semi-bold" to="muli" weight="600" />
    <alias name="muli-bold" to="muli" weight="700" />
</fonts-modification>