Perhaps I am misunderstand the way to access Google Fonts but this is how I would expect to do it, and the font is missing:
But here is the font: https://fonts.google.com/specimen/Jost
There's a hardcoded list of google fonts atm. So newer fonts are often missing. By design.
Until martin fixes this issue you have 2 options: ask and wait, manually add the font yourself. There a few posts about using the transfonter generated css with @import directive inside BSS
We haven't updated the google font definitions recently, we will do it in the next update. Until then you can add it to your page as an external CSS file. Just paste the embed URL that Google Fonts gives you as the URL for your external stylesheet.