If you have downloaded this font, you need to do the following. Import this font into your css/scss file (ex. style.css/style.scss). Be sure to write the format, as formats are different.
@font-face {
font-family: 'Lato';
src: url('/extensions/[extension-name]/assets/Lato.woff2') format('woff2');
}
Next, add the font on the body. The second font is needed for loading if the main font doesn’t work. You can add any other pre-installed font if you wish.
body {
font-family: 'Lato', sans-serif;
}