[NTG-context] How to calculate the height of text of a certain width?

Hello dear All, the following MWE works best: \definelayer[LAY] \starttext \setlayerframed[LAY] [x=0pt,y=20pt] [frame=on, width=300pt, align={right,}] % tolerant}] {\input ward } \flushlayer[LAY] \stoptext Now, it could have a favourable effect on designing a page if the height of a text of certain width could be calculated in advance, depending of the font. Is there a way? As I fear, TeX's means "\setbox" woun't work with aligned texts. Best wishes, remain healthy, Rudolf