Debian recently added support for Hunspell .bdic binary dictionaries used by Qt WebEngine.

https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1020387

https://salsa.debian.org/qt-kde-team/qt/qtwebengine/-/merge_requests/12

There is an upstream request to handle the `QTWEBENGINE_DICTIONARIES_PATH` in a way that is compatible with Debian's implementation.

https://github.com/qutebrowser/qutebrowser/issues/4966

Once that is in place, it might make sense to either recommend or suggest the Hunspell language packages.