{ label: 'Hospital', fieldName: 'Hospital__r', type: 'Name' },
  { label: 'Material number', fieldName: 'Product__r.Mtrl_nbr__c', type: 'Text' },
 { label: 'Product', fieldName: 'Product__r.Name', type: 'Text' }

I am getting blank values in the above field in the lightning data table. Pls help how to show the relation in lightning data table