JetEngine. Profile Builder. Allow to add single user page without base page slug in the URL. Final URL format will be - site.url/<username|id|nicename>/<profile-subpage>/

custom-profile-builder-rewrite.php

<?php
/**
 * You need to set up single user base page in the settings anyway, because it need to grab a content.
 * The only limitation - will not work without subpage slug in the URL.
 */
 
// add rewrite rules
add_filter( 'jet-engine/profile-builder/rewrite-rules', function( $rules, $manager ) {
	
	$pages     = \Jet_Engine\Modules\Profile_Builder\Module::instance()->settings->get_pages();
	$user_page = ! empty( $pages['single_user_page'] ) ? absint( $pages['single_user_page'] ) : false;

	if ( $user_page ) {

		$page_object = get_page( $user_page );

		if ( $page_object ) {
			
			$slug             = $page_object->post_name;
			$raw_data         = \Jet_Engine\Modules\Profile_Builder\Module::instance()->settings->get( 'user_page_structure', [] );
			$subpage_rewrites = [];

			foreach ( $raw_data as $subpage ) {
				$subpage_rewrites[ '([^/]+)/' . $subpage['slug'] . '/?' ] = 'pagename=' . $slug . '&' . $manager->page_var . '=single_user_page&' . $manager->user_var . '=$matches[1]&' . $manager->subpage_var . '=' . $subpage['slug'];
			}

			$rules = array_merge( $subpage_rewrites, $rules );
		}
		
	}

	return $rules;
	
}, 10, 2 );

// change default subpage URL
add_filter( 'jet-engine/profile-builder/subpage-url', function( $url, $slug, $page, $subpage, $manager ) {
	
	if ( 'single_user_page' === $page ) {
		
		if ( ! $slug ) {
			$slug = $subpage['slug'];
		}

		$url = home_url( 
			'/' . \Jet_Engine\Modules\Profile_Builder\Module::instance()->query->get_queried_user_slug() . '/' . $slug . '/'
		);
	}

	return $url;

}, 10, 5 );

How can this code be modified to create a custom URL for a single user page. I need my urls to be site.url/@alias where alias is a user meta field.