[NTG-context] alternative numerical \cite command

Hello list members: For inserting citations ConTeXt offers several \cite command alternatives. If I understand correctly citations can be inserted like: \cite[key], when the document's default cite type is used, or: \cite[authoryear][key], \cite[author][key] etc., where the citation style is set by the first option. These citation styles are predefined in context. What I would like to do is inserting alternative numerical citations: normal superscript citations, like this^1, and occasionally inline citations in brackets, like this one [2]. How could I define alternative numerical citation style, e.g. \cite[inum][key] on the analogy of author, authoryear etc. styles? Thanks, bcsikos