Login/out and register links in submenu

Hey

I am using the following snippet to have login/0ut and register links in my main menu.

///////////// LOGIN AND REGO /////////////////////////////////

//  LOGINOUT AND REGO LINK IN MAIN MENU 

function add_login_logout_register_menu( $items, $args ) {
 if ( $args->theme_location != 'primary' ) {
 return $items;
 }
 
 if ( is_user_logged_in() ) {
 $items .= '<li><a href="' . wp_logout_url() . '">' . __( 'Log Out' ) . '</a></li>';
 } else {
 $items .= '<li><a href="' . wp_login_url() . '">' . __( 'Login In' ) . '</a></li>';
 $items .= '<li><a href="' . wp_registration_url() . '">' . __( 'Register' ) . '</a></li>';
 }
 
 return $items;
}
 
add_filter( 'wp_nav_menu_items', 'add_login_logout_register_menu', 199, 2 );

// END LOGINOUT IN MENU 

I have too many tab on my navigation and so I would like to put the login/out and Register links as submenu items under a single nav tab called Members.

What tweaks to the above snippet are required to achieve this.

Thanks in advance for your help.