Combining wp_list_authors with get_user_meta

What you want is not supported by wp_list_authors(). To output them the way you want you will need to use get_users() and display them yourself.

$authors = get_users(
    array(
        'orderby' => 'display_name',
        'order'   => 'ASC'
    )
);

foreach ( $authors as $author ) {
    echo esc_html( $author->last_name . ' ' . $author->first_name );
}

You can wrap the output in elements as needed, and pass $author->ID to get_user_meta() if you need any metadata. You can get a link to the author archive using get_author_posts_url().