hi,
i havent experience in rest but as it should be regular sql condition, this one might work:
// input string: status = 'OP' AND group.last_name like 'Help Desk'
// escaped:
/in?WC=status%20%3D%20%27OP%27%20AND%20group.last_name%20like%20%27Help%20Desk%27
regards,
cdtj