UpdateExcludedFieldListObserver.php

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<?php
namespace Magento\Weee\Observer;

use Magento\Framework\Event\ObserverInterface;

class UpdateExcludedFieldListObserver implements ObserverInterface
{
    protected $weeeTax;

    public function __construct(\Magento\Weee\Model\Tax $weeeTax)
    {
        $this->weeeTax = $weeeTax;
    }

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

        $block = $observer->getEvent()->getObject();
        $list = $block->getFormExcludedFieldList();
        $attributes = $this->weeeTax->getWeeeAttributeCodes(true);
        $list = array_merge($list, array_values($attributes));

        $block->setFormExcludedFieldList($list);

        return $this;
    }
}