Magento 2: How to Add the filter option value in title on category page?

Step 1). Create the Vendor/Module/etc/frontend/event.xml in your module

<event name="controller_action_postdispatch">
   <observer name="change_title_filter" instance="Vendor\Module\Observer\Filtertitle" />
</event>

</event>

Step 2). Create the Vendor/Module/Observer/Filtertitle.php in your module

<?php

namespace Vendor\Module\Observer;

use Magento\Framework\Event\ObserverInterface;
use Magento\Framework\Event\Observer;
use Magento\Framework\View\LayoutInterface;

class Filtertitle implements ObserverInterface
{
    protected $context;
    public function __construct(
        \Magento\Framework\View\Element\Template $context,
        \Magento\Framework\View\Result\Page $resultPage,
        \Magento\Framework\View\Page\Config $pageConfig
    ) {
        $this->pageConfig = $pageConfig;
        $this->resultPageFactory = $resultPage;
        $this->context = $context;
    }  
    public function execute(\Magento\Framework\Event\Observer $observer)
    {
        $layout = $this->context->getLayout();
        $pageMainTitle = $layout->getBlock('page.main.title');
        if ($pageMainTitle) {
            $blockfilter = $layout->getBlock('catalog.navigation.state');
            if($blockfilter){
                $selectedFilters = $blockfilter->getActiveFilters();
                if (!empty($selectedFilters)){
                    $filters = array();
                    foreach($selectedFilters as $filter){
                        $filters[] = $blockfilter->stripTags($filter->getLabel());
                    }
                    if(count($filters) > 0){
                        $activefilters = __("Your selection: ").implode(" - ", $filters);
                        $pageMainTitle->setPageTitle($activefilters);
                    }
                }
            }
        }
    }
}

<?php

namespace Vendor\Module\Observer;

use Magento\Framework\Event\ObserverInterface;

use Magento\Framework\Event\Observer;

use Magento\Framework\View\LayoutInterface;

class Filtertitle implements ObserverInterface

{

protected $context;

public function __construct(

\Magento\Framework\View\Element\Template $context,

\Magento\Framework\View\Result\Page $resultPage,

\Magento\Framework\View\Page\Config $pageConfig

) {

$this->pageConfig = $pageConfig;

$this->resultPageFactory = $resultPage;

$this->context = $context;

}

public function execute(\Magento\Framework\Event\Observer $observer)

{

$layout = $this->context->getLayout();

$pageMainTitle = $layout->getBlock('page.main.title');

if ($pageMainTitle) {

$blockfilter = $layout->getBlock('catalog.navigation.state');

if($blockfilter){

$selectedFilters = $blockfilter->getActiveFilters();

if (!empty($selectedFilters)){

$filters = array();

foreach($selectedFilters as $filter){

$filters[] = $blockfilter->stripTags($filter->getLabel());

}

if(count($filters) > 0){

$activefilters = __("Your selection: ").implode(" - ", $filters);

$pageMainTitle->setPageTitle($activefilters);

}

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