Add Subscriber Field Data via Email Command

As is the case of adding or removing email addresses on an email list via an email message to the server, can you add Subscriber Field data the same way?

Example: I would like to add jsmith@abc.com to the email list "members@somedomain.com". So I would send an email to STServ@somedomain.com with the command "subscribe".

Can I include the person's name that is subscribing in the Subscriber Field that I have set up?