There are several ways, you can register a shortcode in the main user-registration-aide.php and add a function that would display the field and then add the shortcode to the template, something like:
function addmyshortcode (){
$current_user = wp_get_current_user();
$username = $current_user->user_login;
$first_name = $current_user->first_name;
$last_name = $current_user->last_name;
$display_name = $current_user->display_name;
echo ‘hello ‘ . $first_name . ‘ ‘ . $last_name;
}
add_shortcode( ‘myshortcode’, ‘addmyshortcode’ );
Something along those lines to extract the user data you want to display, then add the [myshortcode] to the template, or you could try to add the code itself right to the template, however I am not quite sure if that wil work or not, and it is not the best idea. I am working on an update which will be released soon and may be able to add a feature like that in it.