How to total DataStoreCluster Capacity and FreeSpace not individual DataStores?

I have seen several examples of generating a report that list the CapacityTB and FreeSpaceTB for a individual Datastores within a DataStoreCluster, but I cannot determine how to just generate:

1.  The total CapacityTB of a data store cluster

2.  The total FreeSpaceTB of a data store cluster

3.  Determine a Provisioned % of a data store cluster, e.g FreeSpaceTB / CapacityTB

I had been using an example that Lucd posted and lightly modified:

foreach ($vc in $VIServer) {

Get-DatastoreCluster -Server $vc |

  Select @{N = 'vCenter'; E = {$vc.Name}},

   @{N = 'Datacenter'; E = {(Get-Datastore -RelatedObject $_ | select -First 1).Datacenter.Name}},

   @{N = 'DSC'; E = {"some DataStoreCluster"}},

  CapacityGB,

   @{N = 'FreespaceTB'; E = {[math]::Round($_.FreespaceTB, 2)}},

   @{N = 'Freespace%'; E = {[math]::Round($_.FreespaceTB / $_.CapacityTB * 100, 1)}},

   @{N = 'ProvisionedSpaceTB'; E = {

   [math]::Round(($_.ExtensionData.Summary.Capacity - $_.Extensiondata.Summary.FreeSpace + $_.ExtensionData.Summary.Uncommitted) / 1TB, 2)}

   },

   @{N = 'UnCommittedTB'; E = {[math]::Round($_.ExtensionData.Summary.Uncommitted / 1TB, 2)}},

   @{N = 'VM'; E = {((Get-View -Id $_.ExtensionData.ChildEntity).VM.Count | Measure-Object -Sum).Sum}}

}

But it only returns individual DataStores, when I what I really want is to see total for the DataStoreCluster.

I would really love to just limit it to the DataStoreClusters within a specific Cluster of the DataCenter.  I'm exhausted my very limited PowerShell skills.