[NTG-context] TABLE width question

Hi, looking through enattab and this list's archive I saw that we have … \bTABLE[option=stretch] … to make a table wide as textwidth, and … \setupTABLE[column][1][width=.5\hsize] … to make the first column half of textwidth. Now, I want to have the *entire* table scaled .75 of textwidth (set the columns width automatically). Is there also an option / a command for this? Steffen