[NTG-context] margintext style

[batela]

Dear Sirs

Is there any way to format margintext notes. I want to justify and 
apply this  format to my margin notes:

\def\MarginStyle{%
   \switchtobodyfont[7pt]\setupinterlinespace[line=9pt]%
   \setuphz\setupprot\emergencystretch=.5em
   \setuptolerance[{horizontal,verytolerant}]%
}

Thanks in advance

Jorge