Date Created and Date access null from Azure Data Lake Gen2

Hi, I created a container in Azure storage and added few blobs to it. When I use the container as data source in power BI, I notice that the Date Access and the Date Created value are both null. I also noticed the same thing on the example provided on Microsoft website Azure Data Lake Storage Gen2 - Power Query | Microsoft Learn. How can I can get those two values to be populated ? I searched online and all the examples and videos that I see have those two values set as null.  
Thank you for your help.