[NTG-context] Typesetting levels of index differently

Dear list members, I would like the second level of an index item be typeset differently from the first level, e.g. as in \starttext \index{level+{\it second}} \completeindex \stoptext Instead of adding {\it ... } to each \index separately, could this be realized systematically, in e.g. one \setupregister command: \setupregister[.?.] \starttext \index{level+second} \completeindex % rendering 'second' as italic \stoptext Sytse