Hi,
You can retrieve the settings for each using the ResourceId. For example:
$blobSetting = Get-AzDiagnosticSetting -ResourceId /subscriptions/<subscription id>/resourceGroups/DefaultResourceGroup-CUS/providers/Microsoft.Storage/storageAccounts/spstorageaccountdiag/blobServices/default
$queueSetting = Get-AzDiagnosticSetting -ResourceId /subscriptions/<subscription id>/resourceGroups/DefaultResourceGroup-CUS/providers/Microsoft.Storage/storageAccounts/spstorageaccountdiag/queueServices/default
$tableSetting = Get-AzDiagnosticSetting -ResourceId /subscriptions/<subscription id>/resourceGroups/DefaultResourceGroup-CUS/providers/Microsoft.Storage/storageAccounts/spstorageaccountdiag/tableServices/default
$fileSetting = Get-AzDiagnosticSetting -ResourceId /subscriptions/<subscription id>/resourceGroups/DefaultResourceGroup-CUS/providers/Microsoft.Storage/storageAccounts/spstorageaccountdiag/fileServices/default
If the above is helpful please click Accept Answer.
Thanks.
-TP