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Render key and value of a field

I have a field (list integer) and I would like to render its keys and values. I found field.html.twig but within I only have access to item.content which is the value. I would also like to access the key. I also had a look to theme_preprocess_field(&$variables) but I’m not able to get the correct keys.

I tried 

  foreach ($variables['items'] as $key => $item) {     $variables['items'][ $key ]['key'] = $key;   }

Unfortunatelly this only gives me the array positions 0,1,2 … But I would like to have the actual keys from my list, i.e.

100|red 200|green 300|blue 400|black …

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Render key and value of a field

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