How to list Extended Properties for all databases

I am currently working on task where we use Central Management Server and Server Group for easy access to our SQL server boxes. I am trying to query the extended properties for all databases on multiple SQL Servers as can be seen below: > Is there a way that can be done using TSQL script? I am using the code snippet from this social.msdn post that is pretty close to what I want to achieve, but my powershell skills are zero to none: Please find the script below :

$s = New-Object ('Microsoft.SqlServer.Management.Smo.Server') "computer\instance" 

$dbs = $s.Databases

$query = @"
SELECT objtype, 
        objname, 
        name, 
        value 
FROM fn_listextendedproperty(default, default, default, default, default, default, default);
"@

foreach($db in $dbs) {
    $ds = $db.ExecuteWithResults($query)

    $table = $ds.Tables;

    foreach($row in $table) {

        Write-Host $row.Item("objtype") `
            $row.Item("objname") `
            $row.Item("name") `
            $row.Item("value");
    }
}

To add to the complication I am using the above Powershell script within in Jenkins.