XF 2.2 How to passing custom variables from Controller into a template

[hongtrang]

I develop an addon. Please tell me how I can pass a variable in my controller to the thread_new_posts template.
My Controller:

<?php

namespace HT\BnsForumImplement\Pub\Controller;

use XF\Mvc\ParameterBag;
 use XF\Pub\Controller\Thread;

class Thaoluanrd extends Thread
{
    
    public function actionThaoluanrd (ParameterBag $params)
    {
        $startEndDate = explode('-', $params->start_end_date);
        $startDate = intval($startEndDate[0]);
        if (!$startDate) {
            return $this->notFound();
        }
        $endDate = !empty($startEndDate[1]) ? intval($startEndDate[1]) : null;

        $this->assertNotEmbeddedImageRequest();
        $thread = $this->assertViewableThread($params->thread_id, $this->getThreadViewExtraWith());
        $threadTypeHandler = $thread->TypeHandler;

        $overrideReply = $threadTypeHandler->overrideDisplay($thread, $this);
        if ($overrideReply) {
            return $overrideReply;
        }

        $threadRepo = $this->getThreadRepo();

        
         $filters = [
             ['post_date', '>=', $startDate],
         ];

     

        $page = 1;
        $perPage = 10000;


        $effectiveOrder = $this->filter('order', 'str');
        $defaultOrder = $thread->TypeHandler->getDefaultPostListOrder($thread);
        $availableSorts = $this->getAvailablePostListSorts($thread);
        if (!$effectiveOrder || !isset($availableSorts[$effectiveOrder])) {
            $effectiveOrder = $defaultOrder;
        }

       .......................................................................

        if ($extraFetchIds) {
            $extraFinder = $postRepo->findSpecificPostsForThreadView($thread, $extraFetchIds);

            $this->applyPostListFilters($thread, $extraFinder, $filters, $extraFetchIds);
            $thread->TypeHandler->adjustThreadPostListFinder(
                $thread,
                $extraFinder,
                $page,
                $this->request,
                $extraFetchIds
            );

            $fetchPinnedPosts = $extraFinder->fetch();
            $posts = $posts->merge($fetchPinnedPosts);
        }

        $threadPlugin = $this->plugin('XF:Thread');
        $threadPlugin->fetchExtraContentForPostsFullView($posts, $thread);

        $threadViewData = $threadTypeHandler->setupThreadViewData($thread, $posts, $extraFetchIds);
        if ($isFirstPostPinned) {
            $threadViewData->pinFirstPost();
        }
        if ($highlightPostIds) {
            $threadViewData->addHighlightedPosts($highlightPostIds);
        }

        /** @var \XF\Repository\UserAlert $userAlertRepo */
        $userAlertRepo = $this->repository('XF:UserAlert');
        $userAlertRepo->markUserAlertsReadForContent(
            'post',
            array_keys($threadViewData->getFullyDisplayedPosts())
        );

        // note that this is the last shown post -- might not be date ordered any longer
        $lastPost = $threadViewData->getLastPost();

        if ($isSimpleDateDisplay) {
            $threadRepo->markThreadReadByVisitor($thread, $lastPost->post_date);
        }

        $threadRepo->logThreadView($thread);

        $overrideContext = [
            'page' => $page,
            'effectiveOrder' => $effectiveOrder,
            'filters' => $filters
        ];

        $pageNavFilters = $filters;
        if ($effectiveOrder != $defaultOrder) {
            $pageNavFilters['order'] = $effectiveOrder;
        }

        $creatableThreadTypes = $this->repository('XF:ThreadType')->getThreadTypeListData(
            $thread->Forum->getCreatableThreadTypes(),
            \XF\Repository\ThreadType::FILTER_SINGLE_CONVERTIBLE
        );

        $viewParams = [
            'thread' => $thread,
            'forum' => $thread->Forum,
            'posts' => $threadViewData->getMainPosts(),
            'firstPost' => $threadViewData->getFirstPost(),
            'lastPost' => $lastPost,
            'firstUnread' => $threadViewData->getFirstUnread(),
            'isSimpleDateDisplay' => $isSimpleDateDisplay,
            'creatableThreadTypes' => $creatableThreadTypes,
            'endDate' => $endDate,

            'isFirstPostPinned' => $isFirstPostPinned,
            'pinnedPost' => $threadViewData->getPinnedFirstPost(),
            'highlightedPosts' => $threadViewData->getHighlightedPosts(),
            'templateOverrides' => $threadTypeHandler->getThreadViewTemplateOverrides($thread, $overrideContext),

            'availableSorts' => $availableSorts,
            'defaultOrder' => $defaultOrder,
            'effectiveOrder' => $effectiveOrder,
            'filters' => $filters,

            'canInlineMod' => $threadViewData->canUseInlineModeration(),

            'page' => $page,
            'perPage' => $perPage,
            'totalPosts' => $totalPosts,
            'pageNavFilters' => $pageNavFilters,
            'pageNavHash' => $isFirstPostPinned ? '>1:#posts' : '',


            'attachmentData' => $this->getReplyAttachmentData($thread),

            'pendingApproval' => $this->filter('pending_approval', 'bool')
        ];

        list($viewClass, $viewTemplate) = $threadTypeHandler->getThreadViewAndTemplate($thread);
        $viewParams = $threadTypeHandler->adjustThreadViewParams($thread, $viewParams, $this->request);

        return $this->view($viewClass, 'thread_view_thaoluan_rd', $viewParams);
    }     
}

Now, how to passing $endDate to thread_new_posts template
Please help me!