Uncredited narrators in documentaries?

I know that, for the most part, uncredited voice roles are not eligible to be listed, which I think is fair enough. But there are some exceptions made (e.g. if the person is particularly high profile), and it seems to be that a narrator in a documentary is a significant enough person that might be worthwhile to be listed even if uncredited. For that reason, I submitted one as part of a new episode submission 250528-110148-370000 but it was declined. Is there an official view on this?