Expression for trigger specific interface

[mulbzh]

Hello and sorry for my English

I use ASA Template to monitor my ASA Firewall on all interface. All works fine.

I have create this trigger that send me an alert when intpout traffic on all interfaces is more than 150Mbps: {Template Cisco ASA Discovery:ifInOctets[{#SNMPVALUE}].min(300)}>157286400

This trigger works well but now i want to create trigger for specific interface and not for all. For example, trigger for interface name "giga1"

So i try this :

{Template Cisco ASA Discovery:ifInOctets[{giga1}].min(300)}>157286400 ---> Zabbix tell me "expression is wrong"

{Template Cisco ASA Discovery:ifInOctets[1].min(300)}>157286400 ---> "1" is number of interface : Zabbix tell me "expression is wrong"

{Template Cisco ASA Discovery:ifInOctets.1.min(300)}>157286400 ---> "1" is number of interface : Zabbix tell me "expression is wrong"

So what is the good expression to get trigger for one interface ?

thanks