Hi @johannesw114391 I hope you have gone through the below adobe links
for more information
https://experienceleague.adobe.com/docs/analytics/components/dimensions/referrer-type.html?lang=en#populate-this-dimension-with-datahttps://experienceleague.adobe.com/docs/analytics/components/dimensions/referrer.html?lang=en#populate-this-dimension-with-data
Thanks,Kishore.