Get Some SNMP OID Informations with an element

[colizab]

Hi,
I need some help
I've installed a zabbix server and i already have some metric
I connect my firewall to my zabbix server with snmpv3 with a snmp template and i got some information on network traffic but i want have information on current vpn connexion

Example when i request my firewall with snmpwalk :
sudo snmpwalk -v 2c -c community 192.168.1.1 1.3.6.1.4.1.11256.1.17.1.1.3
iso.3.6.1.4.1.11256.1.17.1.1.3.0 = STRING: "[email protected]"
iso.3.6.1.4.1.11256.1.17.1.1.3.1 = STRING: "[email protected]"
iso.3.6.1.4.1.11256.1.17.1.1.3.2 = STRING: "name3@domain,fr"
iso.3.6.1.4.1.11256.1.17.1.1.3.3 = STRING: "[email protected]"

I would like in just one element have all information (name1, name2, ...)

So i create an element with this OID SNMP:
iso.3.6.1.4.1.11256.1.17.1.1.3

But i get this error when i make a test :
No Such Instance currently exists at this OID

I don't have any error when i tried with this parameter :
iso.3.6.1.4.1.11256.1.17.1.1.3.1 --> [email protected]

does it exist a way for have all result of oid "iso.3.6.1.4.1.11256.1.17.1.1.3" in result of this element ?
I've test on LLD rules but don't success to make this !

Thanks all