Fetchdata for specific fieldValues

Hello.

I would really like to be possible to use /api/v1.0.1/entities:fetchdata for specific fieldvalues.

For instance i'm fetching data for 1000 entities to only get "ItemName" for each of this entities, and im getting like 130000 lines in 1 request with alot of information that I don't need.

So it would be awesome to filter before the request than after.

Thank you in regards!