Any way to specify the Entry Creator from Zapier?

Hi all, I am trying to set up a system that allows customers to send an email to a specific Zapier email, with a specific format, and that will create a Gravity Forms entry.

The issue I am running into is that I have other code on my site that looks at the Entry Creator to populate some correct information. I don’t see a way to set the Entry Creator from the Zapier creation.

Any thoughts on how to do this, without having to manually go in and change it on each entry?