markdownpart is curently in kdereview, but should leave it Aug 29th.
It would become part of Extragear, but will join release service for 20.12.
Still would be good to have it covered on build.kde.org already now, so being in the extragear group seems to make sense for now.
openSUSE & FreeBSD builds make sense, as there is no-one (yet?) to support this on Windows.