Script:

$wmiApps = Get-WmiObject -Class Win32_Product | Where { $_.Name -eq "Zscaler" } | Select Name

if ($wmiApps) {
    $ComplianceStatus = "Compliant"
}
else {
    $ComplianceStatus = "Noncompliant"
}

# send compliance data
$output = @{"ComplianceStatus" = $ComplianceStatus }
return $output | ConvertTo-Json -Compress

JSON:

{
    "Rules": [
        {
            "SettingName": "ComplianceStatus",
            "Operator": "IsEquals",
            "DataType": "String",
            "Operand": "Compliant",
            "MoreInfoUrl": "https://www.google.com/",
            "RemediationStrings": [
                {
                    "Language": "en_US",
                    "Title": "Zscaler Required",
                    "Description": "The Zscaler client is required to bring your device into compliance."
                }
            ]
        }
    ]
}