It's possible edit the file imEmailForm.php to take a value of the form fields and add it to the object or subject of the email that will be sent when the contact form is completed?

My configuration is as follows:

The form has multiple fields to fill, including "Name"

The subject of the mail to send: Website Message of

I want to know how to add in the file imEmailForm.php the "Name" field at the end of the subject "Website Message of " to differentiate and derive multiple contacts received.

I hope someone can help me.

Thanks in advance.