Associate reviews to user

Hi,
now with the plugin I can assign the reviews to a page with “assign_to” and “assigned_to” attributes.

On my web-site I have a membership area, on page “user” I show the profile of members with the plugin shortcode (ultimate member). So I have one page displaying everytime different member’s profile.

I would like to give possibility to review the members, so is it possible to assign reviews to a specific user on my membership area instead of pages (something like “assign_to=”Username”)?

All the user pages have this adress:
https://www.mywebsite.com/user/user1
https://www.mywebsite.com/user/user2
etc.
Maybe I can assign the review to adress instead of numeric page ID?