\usemodule[simplefonts]

\definesimplefont[crimTW][crimson][size=12pt] 
\definesimplefont[karlaHG][karla][size=56pt] 

\starttext
\section{\karlaHG \Cap{bla}}

\crimTW Foo jqwghd qwdjkh qwkjdh qwjkdh qjkdw kjwh dkjhd qwkjh

\stoptext
