[NTG-context] ConteXt commands in an rtl environment

I am having trouble entering ConteXt commands in an rtl language, in this case Hebrew. How does one make the last(left hand) letter of the Hebrew word אשר a superscript? My experiments with \high{...} have not been successful so far in part, I think, because I have not got the brackets right. Any tips or pointers will be gratefully received. Alan