Powershell Json Array

Question

In relation to this question that was answered, we now have an issue where some values are arrays and we need to retain that structure

The code as it stands is:

function Get-Node {
    [CmdletBinding()][OutputType([Object[]])] param(
      [ScriptBlock]$Where,
      [AllowNull()]   
      [Parameter(ValueFromPipeLine = $True, Mandatory = $True)]$InputObject,
      [Int]$Depth = 90
    )
    process {
      if ($_ -isnot [String] -and $Depth -gt 0) {
        if ($_ -is [Collections.IDictionary]) {
          if (& $Where) { $_ }
          $_.get_Values() | Get-Node -Where $Where -Depth ($Depth - 1)
        }
        elseif ($_ -is [Collections.IEnumerable]) {
          for ($i = 0; $i -lt $_.get_Count(); $i++) { 
            $_[$i] | Get-Node -Where $Where -Depth ($Depth - 1) 
        }
        }
        elseif ($Nodes = $_.PSObject.Properties.Where{ $_.MemberType -eq 'NoteProperty' }) {
          $Nodes.ForEach{
            if (& $Where) { $_ }
            $_.Value | Get-Node -Where $Where -Depth ($Depth - 1)
            Write-Host "In Second If " $_.Value
            Write-Host "In Second If 2" $_
          }
        }
      }
    }
  }

And the above function is called via:

if ($content.properties.policyRule -ne $null){            
            foreach ($rule in $policyRule){
                $Node = $content.properties | Get-Node -Where {$_.name -eq $rule -and $_.value -Match "^\[\w+"} 
                $Node | ForEach-Object {
                    $_.Value  = '[' + $_.Value
                }  
            }
        }

And what we are seeing is this:

"notIn":  "[[concat(subscription().id,'/')] [subscription().id] /"

What we ideally want:

"notIn":  ["[[concat(subscription().id,'/')]", "[[subscription().id]", "/"]

Any suggestions would be grateful