Role(s) field on data table (selected users send)

Hi,

I have this perfect plugin. I want on Selected Users page for send mail, to add a collumn on data table for the each role of each user on the table. So right from email for example to show a additional collumn with each role.

How I can do this? I have try some changes on the .php file of this page but not works. Any ideas?

Thank you!