Cannot see system Chinese font in a snap app

I’m currently using WhatsDesk’s snap package in my Fedora, which is a Whatsapp web client wrapped in an electron app.

In the Whatsapp web interfaces, Chinese characters can be show perfectly normal. But if I try to upload an image in my message, the snap app will open me a nautlius file manager window, which all Chinese interface text are messaged up. Every character is a square:

This is usually a sign either when

  1. the Linux application has no access to Chinese font, or
  2. the Linux environment has their font misconfigured.

Do you have any idea how I might fix this within userspace? Or do I absolutely need to fix this from the Snap app? Also, how a snap app might do to prevent this from happening?

Thanks.