Create shortcode to display admins first & last name

I want to display the site admins first & last name on a page for all viewers & logged in users alike.

I have the following shortcode that I got help with so I can display the admins name in my header.php template.
Would it be easy to update the following code that displays the info I need correctly so I could have a shortcode that could be used on my pages as well? Something like [admins_first_last]?

Thanks!!

<?php
function z_show_current_name(){
	// Get the current admin user, using it's registered email as key
	$user_info = get_user_by( 'email', get_option('admin_email'));
	// Use the user_info found to distill the info wanted
	$user_fname = $user_info->first_name;
	$user_lname = $user_info->last_name;
	$text = 'TESTING: ';
	// Return the output to show
	return '<span class="lmn_user_info lmn_user_fname">' . $user_fname . '</span><span class="lmn_user_lname"> ' . $user_lname . '</span>';
}
?>