Hi,
Since this is a pretty important package, I grep'd the package to see
what fonts are included. It looks like some of them are already in
Debian:
Roboto https://packages.debian.org/bullseye/fonts-roboto
Ubuntu https://packages.debian.org/bullseye/fonts-ubuntu
Open Sans https://packages.debian.org/sid/fonts-open-sans
Lato https://packages.debian.org/sid/fonts-lato
Cabin Sketch https://packages.debian.org/sid/fonts-cabinsketch
The rest are all SIL OFL licence (Debian compatible). I was able to find
sources for all but two:
Montserrat https://github.com/JulietaUla/Montserrat
Nunito Sans https://github.com/googlefonts/NunitoSans
Nunito https://github.com/googlefonts/nunito
Inter https://github.com/rsms/inter/
News Cycle https://bazaar.launchpad.net/~n8/newscycle/
Raleway https://github.com/impallari/Raleway/
Neucha ?
Source Sans Pro ?
Best,
Eric