[Plugin: Contact Form 7] Populate dropdown values using PHP

I really like the looks of this plugin, but I have dynamic options I need to load from my database for the dropdown.

I see that PHP code is not evaluated if inserted into a form. I need something like this:

<?php $all_country_names = get_country_names('list');?>
Country: [select Country include_blank <?php print $all_country_names;?>]

I really did look around for a solution but all I found were unresolved questions along the same lines.