Power BI Custom Connector - Azure DataLake

Hello Power BI Community,  

I am trying to create a powerbi custom connector using VS2019 that would list the storage contents of an Azure Data Lake (or Azure Storage Blob).  A key is required to access the data lake but how does one specify the authentication key required in M?  I don't see any options to specify the key in the optional parameters of AzureStorage.DataLake.   Any help would be greatly appreciated.  Thanks. 

datalake_ext = (url as text) =>    let        source = AzureStorage.DataLake(url)  //or AzureStorage.Blobs(url) for Blob Storage        //authenticate to datalake using key?
    in        source;