Get-ShadowStorageSpace.ps1

function Get-ShadowStorageSpace {
    [CmdletBinding()]
    param (
        [Parameter(Mandatory,
            Position = 0,
            ValueFromPipeline=$true,
            ValueFromPipelineByPropertyName=$true)]
        [string[]]
        $ComputerName
    )

    process {
        foreach ($computer in $ComputerName) {
            $ShadowStorage = Get-CimInstance -ClassName Win32_ShadowStorage -ComputerName $computer
            
            foreach ($disk in $ShadowStorage) {
                $volObj = Get-CimInstance -ClassName win32_volume -ComputerName $computer | ? deviceid -eq $disk.volume.deviceid

                [pscustomobject]@{
                    AllocatedSpace = "{0:N2} Gb ({1:N1}%)" -f ($disk.allocatedspace / 1GB), ($disk.UsedSpace / $volObj.Capacity * 100)
                    UsedSpace      = "{0:N2} Gb" -f ($disk.usedspace / 1GB)
                    MaxSpace       = "{0:N2} Gb" -f ($disk.maxspace / 1GB)
                    DriveLetter    = $volObj.Name
                    ComputerName   = $disk.pscomputername
                }
            }
            
        }
    }
}