Adding a new property to an array of objects. Parallel

I'd like to add a new property to an array of objects. Add-member doesn't work, please assist

$computers = Get-ADComputer -Filter {(name -like "SMZ-*-DB")} | select -First 30
workflow test-test
{
    param([Parameter(mandatory=$true)][string[]]$computers)
    $out = @()
    foreach -parallel -throttlelimit 20 ($computer in $computers)
    {
        sequence
        {
            [bool]$ping = (Test-Connection $computer.name -Quiet -Count 1)
            $computer = $computer | Add-Member -NotePropertyName "Ping" -NotePropertyValue $ping            
            $Workflow:out += $computer
            

        }
    }
    return $out  

}
test-test $computers

You can do something like this in powershell 7. It looks like the ADComputer objects from Get-ADComputer are read-only, so you can't add members to them.

Get-ADComputer -filter 'name -like "a*"' -resultsetsize 3 |
foreach-object -parallel {
  $computer = $_
  $ping = Test-Connection $computer.name -Quiet -Count 1
  [pscustomobject]@{
    ADComputer = $computer
    Ping = $ping
  }
}

ADComputer                      Ping
----------                      ----
CN=A001,DC=stackoverflow,DC=com True
CN=A002,DC=stackoverflow,DC=com True
CN=A003,DC=stackoverflow,DC=com True