If you get all the ESXi nodes for all vCenters, you can include the vCenter.

Connect-VIServer = "vCenter1","vCenter2","vCenter3","vCenter4"

Get-VMHost | 
Get-VMHostFirewallException | 
Where-Object {$_.Enabled -and $_.ExtensionData.AllowedHosts.AllIP} |
Select @{N='vCenter';E={([uri]$_.VMHost.ExtensionData.Client.ServiceUrl).Host}},
    @{N='VMHost';E={$_.VMHost.Name}}, 
    Name, Protocols, IncomingPorts, OutgoingPorts, ServiceRunning