[NTG-context] before= and after= for \setuphighlight

Hi, I'm looking for something like \definehighlight which I can use to markup various things in inline body text. I want different environments to be able to have their own setups to configure how these appear, just as \setuphighlight would provide. However there's one situation which I can't think how to handle; I'd like to have a setup append and prepend some text, just like before= and after= for various other setups. If \setuphighlight had before= and after=, this would suit me perfectly. But it doesn't. Is there something similar to \setuphighlight which has before= and after=? Or any other ideas? Thank you, -- Kate