Update on supporting other types of common resources (Fonts, CSS)?

There have been many issues and comments on this tracker on this subject, of including more resources and CDNs like Google Fonts in Decentraleyes, etc. But, surprisingly, I haven't been able to find any recent nor definitive mention of this subject, though it has, apparently, been in the plans for years. Where does this stand?

Being able to include and subsequently serve cached user-defined, custom resources would also be useful, to be able to cover additional common resources that Decentraleyes does not officially support yet or does not wish to support. Seems to have been an old PR in this area for the before-WebExtension version.