Thanks for reaching out. Is the issue you’re having the choice of fonts specifically, or is it an inibility to set a specific font or the subtitles only?
If you’re using a Shopify-supported theme, then adjusting the fonts for certain areas might be something that our Theme Support team can help you with. While we’re unable to provide account-specific support via the Shopify Community, we’d be happy to continue assisting you with a customization request through live chats. Simply visit the Shopify Help Center and login to your account to create a support request.
If you’re using a third-party or custom theme, then we’d recommend getting support for your theme from the theme designers. However, if the theme designers don’t offer customization support, then you may need to consider hiring a developer to assist you with the theme. Should you need help finding a developer for your store, then we’d recommend taking a look at our directory of certified developers on Shopify Partners.