How to extract a line from the eventlog in Zabbix?

Question

Zabbix

It is necessary to build a graph in Zabbix based on the OS boot duration data from the eventlog.
The key eventlog[Microsoft-Windows-Diagnostics-Performance/Operational,,"Error|Critical",,100] returns data like this:

Windows запущена: 
Длительность загрузки	:	197669ms 
IsDegradation	:	false 
Время события (UTC)	:	‎2017‎-‎04‎-‎20T07:05:58.702800400Z

That is, you need to extract the number 197669 in this case