Key as a parameter for function

[vendrusculo]

Hello!

Quick question, is possible to use a "key" as a parameter for a function?

Key1 = custom.value[1]

Key2 = custom.time[1]

CalcItem = avg("custom.valor[1]",last("custom.tempo[1]"))

I tried many ways to use this but without success...

In fact I need a trigger to monitor if "custom.value" didn't change for last "custom.time" seconds

Any tip??

Thanks!