Can't import attribute option over API if option is 'visual swatch'

[slavkodick]

Preconditions

1. Magento 2.1.8

Steps to reproduce

1. Import Attribute Option of type visual swatch (Color for example) over http request (API)

2. Code example:
   {
   $option = $this->attrOptionFactory->create();
   $optionLabel = $this->attrOptionLabelFactory->create();

    $optionLabel->setStoreId(0);
    $optionLabel->setLabel('new_color');
   
    $option->setLabel('new_color');
    $option->setStoreLabels(array($optionLabel));
    
    $this->productAttributeOptionManagement->add('color', $option);
   

   }

Expected result

1. New Attribute Option should be imported to backend

Actual result

1. New Atttribute Option does not get imported because there is no entry in eav_attribute_option_swatch table

More info

Until Magento 2.1.7 the plugin did not trigger beforeSave function in swatches/Model/Plugin/EavAttribute and the Import data had not to match visual swatch data structure, it was imported
Since Magento 2.1.8 the function is renamed to beforeBeforeSave and the plugin triggers it,
so the Import data has to follow data structure of visual swatch, but since it is a API Import there is no entry in database and the new Option does not get imported