For Russian I have:

\setuplanguage[ru][patterns={ru}]\mainlanguage[ru]
\definefallbackfamily
  [archimate]
  [ss]
  [Helvetica]
  [preset=range:cyrillic,
   tf=style:light,
   it=style:lightoblique,
   bf=style:regular,
   bi=style:oblique,
   force=yes,
 rscale=1.0]
\definefontfamily [archimate] [ss] [Optima]
\setupbodyfont[archimate]

I can’t find out from ConTeXtgarden what code I must use for modern Greek (‘el’?) and what range I must use for Greek characters (I guess ‘greekandcoptic’ which I’ve seen mentioned somewhere).

Correct?