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So it sounds like you want a dynamic result based on an expression calculation (Total Output / Raw feed Consumed). You won't be able to do this using an Expression Analysis.
Typically you would configure PI Point DR attributes with Time Range based value retrieval methods to calculate summary results. To answer your question, yes you could configure your two input attributes this way, but you are calculating yield based on an expression using these two inputs. It might be possible to get what you are looking for by doing the yield calculation in a Formula data reference, with the two input attributes configured for a time range value retrieval method. This is most likely to give you a dynamic yield calculation based on inputs calculated from a PI Vision provided timerange.
Thanks a lot John, it works, exactly what I need !