Hi Srijan,
Do you know how to style the app with the sass files?
If not, i would recommend to follow the learning path for styling with CSS and Sass.
You can add fonts in your deployment folder.
- Go to your App and open the deployment folder.
- Make a folder called "Fonts” or something where you would like to place these fonts.
- Open your sass file/ variables and work with @font-face.
- Call your font in "font-family-base".
Example