how to install custom downloaded fonts in ionic 4 code example

Example: ionic install font

// in the fonts.scss file, add the font-face for each font file
@font-face {
   font-family: 'Source Code Pro';
   src: url('../assets/fonts/SourceCodePro-ExtraLight.ttf');
   font-weight: 200;
   font-style: normal;
}

// Import font.scss; add the following line to src > app > app.scss
@import '../theme/fonts';