Thank you for reporting this issue! We will fix it in our next release.
You will be able to import a file with several @font-face
declarations and they will be recognized and added as variants of the font (given that they reference the same font of course). You will be able to switch different weights on/off from the Font Manager Dialog just like you do the Google fonts.
We will also detect @font-face
declarations when you import regular CSS files and import them alongside the file if the sources specified in the src
directive are found on the disk.