Miraheze does not host an official wikidata like project as far as I know, but you are free to create one yourself. If you would like to request a wiki, please fill out this form and someone will create your wiki.

On an unrelated note, please don't use Phabricator for general questions like this. These belong on the Community noticeboard. Phabricator is primarily used for tracking bugs, feature requests, and software changes.