[NTG-context] [***SPAM***] small space before some characters (: ; ! ?)

Hello: Hungarian typography requires inserting small spaces before :, ;, ! and ? characters. The width of this small space should be equal to that of the period (.). In latex magyarlatex (magyar.ldf) module (part of biblatex) contains definitions to achieve this. How could I set this in context? Thanks in advance, bcsikos