You can also add in App > HTMLHeader the css styling rules
<style>
@import url('https://fonts.googleapis.com/css2?family=Poppins:wght@300;400;500;700&display=swap');
body{font-family: 'Poppins', Helvetica, sans-serif;}
</style>
Replace Poppins with whatever font name you find and want to use from Google Fonts.