hugo-theme-stack/layouts/partials/footer/components/custom-font.html

<script>
    (function () {
        const customFont = document.createElement('link');
        customFont.href = "https://fonts.googleapis.com/css2?family=Lato:wght@300;400;700&display=swap";

        customFont.type = "text/css";
        customFont.rel = "stylesheet";

        document.head.appendChild(customFont);
    }());
</script>