Squid + TOS or DSCP based on domain to client

["christian@xxxxxxxxx" <christian@xxxxxxxxx>]

Dear,

as i know we can set TOS or DSCP on squid based on HIT or MISS using ZPH 
Feature. but is there any way to set TOS/DSCP based on acl domain ? in 
fact i want to set TOS 0x2 for domain www.facebook.com when return to 
client. so i can give better QoS based on TOS/DSCP.
i tried tcp_outgoing_tos but have no luck. it seem work only for 
outgoing to internet not for returning data to client. any suggestion ?

Regards,

Kristian