\starttypescriptcollection[maintext]
  \starttypescript[serif][maintext]
    \definefontsynonym[Serif][name:EBGaramond-Regular][features=default]
  \stoptypescript

  \starttypescript [maintext]
    \definetypeface[maintext][rm][serif][maintext][default][features=default]
  \stoptypescript
\stoptypescriptcollection

\setupbodyfont[maintext]

\starttext
$n = 1$
\stoptext