CSS & JS from programmatically rendered node

I have a problem and I can’t solve it myself at the moment: In a view, I output some fields of a content type (through id in the context filter) via "REST export". With this view, I would now also like to output css, js and the content of the of the rendered content in a field. For this I built a serializer plugin, where I render the respective content beforehand:

$nid = 36; $entity_type = 'node'; $view_mode = 'default'; $view_builder = Drupal::entityTypeManager()->getViewBuilder($entity_type); $storage = Drupal::entityTypeManager()->getStorage($entity_type); $node = $storage->load($nid); $build = $view_builder->view($node, $view_mode); 

I have already loaded the libraries:

$theme = Drupal::theme()->getActiveTheme(); $lib = $theme->getLibraries(); 

Now I’m looking for what is output in the head on the page and the JS files below.

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CSS & JS from programmatically rendered node

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