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How to add Open Graph Tags in Custom Module detail page?

For Node I already used https://www.drupal.org/project/metatag

For my custom module’s detail page would like to add Open Graph tags for FB share.

So in my_test.module

function template_preprocess_my_detail_page(&$variables) {    $items = $variables['item'];    $title =  $items->title;    $og_title = [         '#tag' => 'meta',         '#attributes' => [           'property' => 'og:title',           'content' => $title,         ],       ];    $variables['page']['#attached']['html_head'][] = [$og_title, 'og_title']; }

Above one suppose to work but NOT WORKING.

function MY_MODULE_page_attachments_alter(array &$page) {    $og_title = [         '#tag' => 'meta',         '#attributes' => [           'property' => 'og:title',           'content' => '',         ],       ];     $page['#attached']['html_head'][] = [$og_title, 'og_title']; }

Above one is working, But I’m not able to get Page Variables. How will I get $variables in above function?

This one called in all pages of module, but I want to call only on detail page as mentioned in proprocess function

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How to add Open Graph Tags in Custom Module detail page?

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