I was having the same query.
Its not the proper way, but for temporary i found one way,
Craete your new hook and call that hook in user-new.php.
write these code in your theme’s functions.php
add_action( ‘user_registration’, ‘my_show_extra_profile_fields’ );
function my_show_extra_profile_fields( $user ) { ?>
<h3>Extra profile information</h3>
// your code
<?php } ?>`
add below code to user-new.php file
<?php do_action(user_registration);?>
