Return a function by Expression.Evaluate

I'm trying to return a function. In my case I have some queries with the name ETL_0001, ETL_0002, etc.

I need to return a function in one step. I tried using:

Expression.Evaluate("ETL_" & Number.ToText( parRecords[ETL_ID], "0000" ) )

but returns error, for example from ETL_0001:

The name 'ETL_0001' does not exist in the current context