There are 100 legal styles for Zotero, including the Bluebook Law Review, Oscola, the European Journal of International Law, the Journal of International Economic Law. There are also a French Canadian style, a Belgian style, and a style from the Bordeaux university if you are looking for a French-speaking style.
Juris-M is an unofficial variant of Zotero, modified and extended to support legal and multilingual referencing, with special features to make referencing to primary legal materials such as cases easier, to follow the conventions of each jurisdiction.