Try like this
Select @{N='VM';E={$_.Parent.Name}},
Name, Filename,
@{N='SCSIid';E={
$hd = $_
$ctrl = $hd.Parent.Extensiondata.Config.Hardware.Device | where{$_.Key -eq $hd.ExtensionData.ControllerKey}
"$($ctrl.BusNumber):$($_.ExtensionData.UnitNumber)"
}}
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