Hello!
Please add new function for item key.
If you use item key eventlog, you cannot make a trigger where you compare by error code, such as:

({Template OS Windows Active Eventlog:eventlog[System,,,,@eventlog,,skip].logeventid()}={Template OS Windows Active Eventlog:eventlog[System,,,@eventlogname,,,skip].logeventid()})=1

Because logeventid does not return code, but only compares with the item itself.