I could only get this working by downloading the font from google and storing it my app, which tbh is probably better for app load time. Then in your scss file:
@font-face {
font-family: AppFont;
src: url("…/assets/fonts/RobotoCondensed-Regular.ttf");
}
body, span, button, h1, h2, h3, h4, h5, h6 {
font-family: ‘AppFont’ !important;
}