Standard fields in Welcome Email?

Hi,
I want to welcome the new users I import with your very cool plugin. Now, I thought I could enter the variables like the ones that are given (**loginurl**, **username**, **password**) and let them be, for example, **role**, **first_name**, **last_name** or **display_name**. Am I doing wrong?
My mail would begin like this:

Willkommen **display_name**,
Ihre Daten zum Login sind:

URL zum Login: **loginurl**
Benutzername= **username**
Password = **password**

Regards,
Peter