You can’t, because of wp-login.php
structure. Here is code with register_form
hook:
<form name="registerform" id="registerform" action="<?php echo esc_url( site_url( 'wp-login.php?action=register', 'login_post' ) ); ?>" method="post" novalidate="novalidate">
<p>
<label for="user_login"><?php _e('Username') ?><br />
<input type="text" name="user_login" id="user_login" class="input" value="<?php echo esc_attr(wp_unslash($user_login)); ?>" size="20" /></label>
</p>
<p>
<label for="user_email"><?php _e('Email') ?><br />
<input type="email" name="user_email" id="user_email" class="input" value="<?php echo esc_attr( wp_unslash( $user_email ) ); ?>" size="25" /></label>
</p>
<?php
/**
* Fires following the 'Email' field in the user registration form.
*
* @since 2.1.0
*/
do_action( 'register_form' );
?>
<p id="reg_passmail"><?php _e( 'Registration confirmation will be emailed to you.' ); ?></p>
<br class="clear" />
<input type="hidden" name="redirect_to" value="<?php echo esc_attr( $redirect_to ); ?>" />
<p class="submit"><input type="submit" name="wp-submit" id="wp-submit" class="button button-primary button-large" value="<?php esc_attr_e('Register'); ?>" /></p>
</form>