how to show label on maps

[dimassym]

i am using zabbix 6.0.8
i want to display throughput label, i do configuration like this:

In: {?last(/Gateway/net.if.in["Interface bge0: Network traffic"])}
Out {?last(/Gateway/net.if.out["bge0"])}
In: {?last(/Gateway/net.if.in["Interface bge0"])}

and the result is "unknown"
can anyone help me?