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Drupal 8: Read field value from $variables in preprocess_html

I’ve been wrestling with Drupal 8 for some time now and have run into a little problem.

I want to get a field value from a content type that I can use in my html--front.html.twig. I can create a new variable that I can use in the twig template i.e

$variables['custom_twig_variable'] = 'Some important value';

Then in my twig template I would simply call this like this

{{ custom_twig_variable }}

The thing here is that I don’t now how to “reach” my field value in the array $variables that is passed into the preprocess_html function.

Array (   [user] => DrupalCoreSessionAccountProxy Object (     [requestStack:protected] => SymfonyComponentHttpFoundationRequestStack Object (       [requests:SymfonyComponentHttpFoundationRequestStack:private] => Array (         [0] => SymfonyComponentHttpFoundationRequest Object (           [attributes] => SymfonyComponentHttpFoundationParameterBag Object (             [parameters:protected] => Array (               [_system_path] => node/4               [_controller] => DrupalnodeControllerNodeViewController::view               [_title_callback] => DrupalnodeControllerNodeViewController::title               [node] => DrupalnodeEntityNode Object (                 [values:protected] => Array (                   [vid] => Array (                       [x-default] => 4                   )                   [field_background_color] => Array (                     [x-default] => Array (                       [0] => Array (                         [value] => ff00ff                       )                     )                   )                 )               )             )           )         )       )     )   ) )

How do I read the value of field_background_color?

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Drupal 8: Read field value from $variables in preprocess_html

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