[NTG-context] Is this possible to do the same

Dear List! Sorry, but my pdf was too big. So I send a little picture. [cid:image001.jpg@01D90E45.CE727480] I would like to know, if there is a modus in ConTeXt like the same in LaTeX. I found this on page 108, Chapter 3 Math symbos LaTeX Compherensive list. Many thanks Uschi