You need to use the LuaHBTeX backend which isn't actually supported by
ConTeXt (and Hans doesn't like it either, I think). There's a plugin mode,
however. If not in the mailing list, more info about Harfbuzz in ConTeXt is
available in some articles.

Regards,

Jairo

El vie., 18 de dic. de 2020 9:24 p. m., Robert Zydenbos <
context@zydenbos.net> escribió:

> Dear all,
>
> Recently I read about the use of Harfbuzz-enhanced LuaTeX with LaTeX for
> writing Arabic. Following that example, I wrote a minimal test text that
> worked excellently for Kannada script as well:
>
> -----
> \documentclass{article}
> \usepackage{fontspec}
>
> \setmainfont{Kedage}[RawFeature={mode=harf;script=knda;}]
>
> \begin{document}
> ಇದು ಹೇಗಿದೆ? ನಾನು ಹೀಗೆ ತುಂಬ ಬರೆಯಬೇಕೆಂದು ಯೋಚಿಸುತ್ತಿದ್ದೇನೆ.
> \end{document}
> -----
>
> I want to do this in ConTeXt too! Can anyone tell me how to translate
> “\setmainfont{Kedage}[RawFeature={mode=harf;script=knda;}]” into ConTeXt?
> This could be the key to using MkIV with Indic scripts.
>
> Robert
>
>
> ___________________________________________________________________________________
> If your question is of interest to others as well, please add an entry to
> the Wiki!
>
> maillist : ntg-context@ntg.nl /
> http://www.ntg.nl/mailman/listinfo/ntg-context
> webpage  : http://www.pragma-ade.nl / http://context.aanhet.net
> archive  : https://bitbucket.org/phg/context-mirror/commits/
> wiki     : http://contextgarden.net
>
> ___________________________________________________________________________________
>