Hi Pascal,
the problem is, that lawyers in Germany are currently warning owners of websites to pay a fee after a judgment by the Munich Regional Court (LG München, Urteil vom 19.01.2022, Az. 3 O 17493/20), if they integrate Google Fonts.
Stories is a great plugin in WordPress that we use massively ourselves, but sending data directly to Google Fonts has become a legal issue against us. This primarily affects website operators in Germany and Austria.
Unfortunately, upload font files (including ones from Google Fonts) on the Settings page does not solve the problem with existing stories, which would then all have to be revised again by hand. Fonts already used in existing stories are not replaced by the locally saved and integrated version.