[NTG-context] How to add directory to input path?

Hello, I bet that I have already asked that, but I don't find or remember the answer. I would like to add some folders to TeX search path. Let's say that I have: main.tex sub/include1.tex and would like to use "\input include1.tex" inside main.tex without having to specify full path, in the same way as \setupexternalfigures[directory=...] can be used. I have tried \usedirectory, \usepath, \usesubpath, but neither works. Well ... actually \usepath works in mkiv, but not in mkii. If I use \usepath then \allinputpaths gets the folder I have specified, but it doesn't seem to work. Thanks, Mojca