Workflow - How to set an attribute to the secondary owner's e-mail address of workflow target?

Hi everyone,

Does anyone know how I can set an attribute of my choice, to the e-mail address of the secondary owner of the workflow target? 

So far, I have the following: 

>>Operation execution: Create User; where secondary owner of workflow target is not empty. 

>>Change object properties (attribute of my choice) set to the E-mail address of workflow target

What I am looking to achieve is the following:

>>Operation execution: Create User; where secondary owner of the workflow target is not empty. 

>>Change object properties (attribute of my choice) set to the E-mail address of workflow's secondary owner. 

Can that even be done? 

Thank you!