Zabbix output disk space to trigger name?

Question

linux

Good day to all
Tell me how you can display the free disk space in the name of the trigger?
Created a trigger

имя: /data free $1 Gb
ключ: {server:vfs.fs.size[/data,free].last(0)}

But the trigger in the events is displayed only / data free Gb
Thanks in advance for the answers

Answer 1

example:
Trigger name: Critical signal level: Lenina,1 ({ITEM.LASTVALUE})
Expression: {BDCOM3310C:epon2-0-2-3-RX-level-lenina1.last()}<={$RXLEVEL_CRIT}
As a result :
Critical signal level: Lenina, 1 (-25.8 dBm)