Multiple fonts

  1. Go to: Dashboard → Site administration → Appearance → Themes → space
  2. Go to: Advanced tab
  3. Scroll to Additional Fonts for different languages section
  4. Check: Add more fonts
  5. Select how many fonts you want to use
  6. Save
  7. Return to section
  8. Fill ‘Font family’ and ‘Language Code’ e.g ‘ru’

Google Fonts

with multiple font family:

https://fonts.googleapis.com/css2?family=Noto+Sans:ital,wght@0,400;0,700;1,400;1,700&family=Poppins:wght@400;500;700&display=swap

Custom Web Font

   <link rel="stylesheet" href="https://use.typekit.net/rwb4gjx.css">
    <style type="text/css">
    [lang="ru"] body {
        font-family: source-code-pro, monospace;
    }
    [lang="fa"] body {
        font-family: quicksand, sans-serif;
    }
    </style>