ArtraLab is developing a new Nonikkor Nocty 50mm f/1.2 lens for Nikon Z-mount. The official announcement is expected in August. The lens will first be released for Nikon Z mount and later for Fuji X and Sony E mount.
ArtraLab already has several lenses for Nikon cameras (check Amazon and the official website for details):
The new ArtraLab Nonikkor 24mm f/1.7 APS-C lens for Nikon Z-mount is now available for pre-order