executing spamassassin from sieve on some of the messages

["Vadim Kutsyy, PhD" <vadim@kutsyy.com>]

I am setting cyrus on sarge, and I want to send some (but not all) 
messages through spamassassin (smapc).  in procmail I would just pipe it 
after I run all of the tests for lists, but what can I do in sieve? My  
understanding that sieve doesn't support pipe, is there any way I can 
execute spamassassin from sieve?

Thanks,