Create a layout on a user route

Question

I'm trying to add a Moderation Dashboard tab to the user page like the Moderation Dashboard module, but I can't use Panels. Is it possible to create a layout on a route using layout builder?

I've created the route in msk_module/my_module.routing.yml with

my_module.moderation_dashboard:
  path: '/user/{user}/dashboard'
  defaults:
    _title: 'Moderation Dashboard'
    _controller: '\Drupal\my_module\Controller\MyModuleDashboardController::index'
  requirements:
    _user_is_logged_in: 'TRUE'

And the links task in msk_module/my_module.links.task.yml with

my_module.moderation_dashboard:
  route_name: my_module.moderation_dashboard
  base_route: entity.user.canonical
  title: 'Moderation Dashboard'
  weight: 30

And started the controller in msk_module/src/Controller/MyModuleDashboardController.php with

<?php

namespace Drupal\my_module\Controller;

use Drupal\Core\Controller\ControllerBase;
use Symfony\Component\HttpKernel\Exception\NotFoundHttpException;

/**
 * Controller for moderation dashboard.
 */
class MyModuleDashboardController extends ControllerBase {

  /**
   * Display the markup.
   *
   * @return array
   *   Return markup array.
   */
  public function index() {
    return [
      '#type' => 'markup',
      '#markup' => $this->t('Hello, World!'),
    ];
  }

}

So the tab is where I want it. The contents for the tab are the block views displays from the views from Moderation Dashboard. I suppose I can use hook_theme() and a template and some small amount of CSS. Just wondering if layout builder can do the same thing as the panel in page manager can do?