[NTG-context] negative indenting

Hi there, I have set \setupindenting[yes,big,first] and I would like to have all paragraphs in a given document with negative indentation. AFAIK, "first" should enable indentation for all paragraphs, but the ones after \section, \subsection or \subsubtsection are not indented. How can I make that the indenting would be negative, that is, that is not the first line the one indented, but the other ones. Thanks, Pablo