[exim] Exim4 userforward question

We used to set up exim4 redirect driver under
/etc/exim4/conf.d/router/600_exim4-config_userforward file like this:

=============================================================================
userforward:
debug_print = "R: userforward for $local_part@$domain"
driver = redirect
domains = +local_domains
check_local_user
file = $home/.forward
require_files = $local_part:$home/.forward
no_verify
no_expn
check_ancestor
allow_filter
forbid_smtp_code = true
directory_transport = address_directory
file_transport = address_file
pipe_transport = address_pipe
reply_transport = address_reply
skip_syntax_errors
syntax_errors_to = real-$local_part@$domain
syntax_errors_text = \
This is an automatically generated message. An error has\n\
been found in your .forward file. Details of the error are\n\
reported below. While this error persists, you will receive\n\
a copy of this message for every message that is addressed\n\
to you. If your .forward file is a filter file, or if it is\n\
a non-filter file containing no valid forwarding addresses,\n\
a copy of each incoming message will be put in your normal\n\
mailbox. If a non-filter file contains at least one valid\n\
forwarding address, forwarding to the valid addresses will\n\
happen, and those will be the only deliveries that occur.

gtgroups:
driver = redirect
domains = +local_domains
local_part_suffix = .*
data = mygroups@???
======================================================================

It means all email coming such as xxx.yyy, qqq.zzz will goto
mygroups@???.

Now I want to setup a email account called john.smith@???
When the email coming, it should redirect to my gmail account
john@???, not mygroups@???

Is it possible?

Cheers,