from my known, there is such OID as you said with inbound and outbound direction, only the OID for whole qos traffic classifier.
as you know, we always apply ACL under traffic classifier, for example:
acl 3000
rule permit ip source 10.1.1.1 0 destination 10.2.1.1 0
#
traffic classifier huawei
if-match acl 3000
so you can see, the ACL rule already set the direction which is from 10.1.1.1 to 10.2.1.1
so the there isn't direction formulation for Qos traffic Classifier