I ended up creating, well, one, even thought the anime will only begin to air by a little bit over half a year haha. Although the anime navbox will have to wait. At least until an episode count is announced. :>
If you think there's a template that needs to exist, feel free to tell me or create one yourself. I'm actually just copy-pasting existing codes and edit them somehow anyway; I don't know how to make one from scratch haha.