The flow-label match for QoS policy map can be achieved by using the TCAM profile “qos-match-ipv6-flow-label” which is available from EOS 4.27.2F onwards. 

This feature allows the user to match the 20 bit IPV6 flow label using the Qos Policy Map and allows to classify the flow-label controlled traffic.

This feature allows the user to configure upto 255 unique QoS policy maps on the front panel ports per FAP.

Support for matching of DSCP / ECN is available under the QOS class map configuration on Arista switches.