[NTG-context] Help wanted: index with chapter and section numbers

Hi, In a math text book, I would like to create an index of some material where chapter and section numbers are given instead of a page number. For instance if the result « 3.2.5 Banach Fixed Point Theorem » is stated in section 2 of chapter 3, and is the fifth numbered statement in that section, I would like to create a \myindex command so that adding the command \myindex{Banach Fixed Point Theorem} at that location, I get in the index created by \myindex a line such as Banach Fixed Point Theorem 3.2.5 Is this possible? Best regards and many thanks for any hint: OK