How to show Comment Count in node template?
Use this code in your theme's YOUR_THEME.theme file:

function YOUR_THEME_preprocess_node(&amp;$variables) {
  // Note: you'll probably want this only for certain content types.
  if ($variables['node']-&gt;getType() == 'YOUR_CONTENT_TYPE') {
    $variables['comment_count'] = $variables['node']-&gt;get('YOUR_COMMENT_FIELD')-&gt;comment_count;
  }
}


And then you can use it in your node.html.twig file like so:

{{ comment_count }}