[NTG-context] \setupheadertexts for chapters with different authors

I thought this should work, since \structurelistuservariable{author} works fine to call the author name into the TOC, but the same does not work for header texts it seems: \setupheadertexts [{\hfill\getmarking[\structurelistuservariable{author}]\hfill}][] [{\hfill\documentvariable{metadata:title}\hfill}][] But it doesn't. What am I doing wrong? Julian