Manchmal muss man Dinge ruhen lassen, dann mit neuer Energie anschauen und vor 
allem die Doku komplett lesen :-)
Die Lösung zu meiner Fragestellung habe ich hier gefunden:

https://docs.typo3.org/typo3cms/extensions/news/AdministratorManual/BestPractice/IntegrationWithTypoScript/Index.html#show-news-items-with-same-category-in-detail-html

Hier nun mein funktionierender Code:

Fluid Template:
<f:cObject 
typoscriptObjectPath="lib.newsRelatedArticlesRegion">{category.uid}</f:cObject>

TYPOscript:
lib.newsRelatedArticlesRegion = USER
lib.newsRelatedArticlesRegion {
 userFunc = TYPO3\CMS\Extbase\Core\Bootstrap->run
 extensionName = News
 pluginName = Pi1
 vendorName = GeorgRinger
controller = News
 settings =< plugin.tx_news.settings

 settings {
   limit = 5
   orderDirection = desc
   useStdWrap := addToList(categories)
   categories.current = 1
   categoryConjunction = or
   excludeAlreadyDisplayedNews = 1
   templateLayout = sidebar
 }

 persistence =< plugin.tx_news.persistence
 view =< plugin.tx_news.view

 action = list
 switchableControllerActions.News.1 = list
}
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