I haven’t seen a community for requesting others to create communities, unless I have missed it. The original purpose of this community is to find discover and promote new communities, and is still the main purpose, but requesting a community is okay, even if it isn’t the main purpose. For example, there was a post recently asking for alternative communities for venting/psychological help and there was some suggestions, and while that wasn’t a post for promotion of new communities, it wasn’t taken down, since it was related to new communities. I would say just to request it and maybe ask if one is already created, and one might be hosted on a different instance that you don’t know about yet