How to refer item by its key in graph title?

[AMSH]

Hello!

I have a custom discovery SNMP-rule which creates an item with key hw.fan.location[{#SNMPINDEX}].It works fine, in host's last data I see it's value. Now I'd like to put this value to the title of a graph in prototype.
The problem is that I cannot refer this item by the key. After reading docs and some archive topics on a forum, my last try looks like this:


But the expression {{HOST.HOST}:hw.fan.location[{#SNMPINDEX}].last()} does not expand to the value of hw.fan.location[X].
Where am I wrong? Thanks in advance!

[AMSH]

At last I've found a correct expression: {?last(/{HOST.HOST}/hw.fan.location[{#SNMPINDEX}])}