Add Relationship Function

Problem/Motivation

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Hi i know this is probably not the right place but I am looking for some help with the group Module. I am using the entity clone module to clone groups and i have gotten it so far that members are cloned with the group but the content is not cloned with it so i am currently trying to do that and have come across the addRelationship() function but that needs a plugin ID and that is where I am lost. I can not get the correct plugin ID. Here the function

public function myPreClone(EntityCloneEvent $event): void {
      $original = $event->getEntity();
      $newEntity = $event->getClonedEntity();
      
      $relationships = $original->getRelatedEntities();
      foreach ($relationships as $relationship) {
        
        $newEntity->save();
        $newEntity->addRelationship($relationship, $relationship->getPluginID(), $values = []);
        $newEntity->save();
      }

    }

Can someone help or tell me where i can ask for help?

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Steps to reproduce

Try to programmtically add a relationship to a group.