Variable filter on throughput time search

Hi all,

I’m looking for a way to use variables to restrict the standard component " Throughput Time Search".

As an example:
I want the standard component to show me the average lead time of the process steps C-F.

I have tried a filter on the component and used the following code:

Unfortunately the filter does not change anything. But I do not get an error message either.

Is my code wrong or does the standard component not provide this possibility?

Thanks for your help!