Looking for all properties MS Purview can detect from eSigned pdf (signed by DocuSign)

Detect a pdf signed by DocuSign in the DLP based on metadata.

Is there a way to detect a file signed by DocuSign in Purview DLP's?

Sample Sudo code below, (assuming DocuSign signed pdf file has some property which Purview can detect, which I can use in ContentPropertyContainsWords condition. )

# script to create 'HK Test Delete after Aug07'
New-DlpCompliancePolicy `
  -Name 'HK Test Delete after Aug07' `
  -Comment 'HK Test Delete after Aug07' `
  -Mode 'TestWithoutNotifications' `
  -ExchangeLocation All `
   ;
     New-DlpComplianceRule `
     -Name 'TST - HK Test Delete after Aug07' `
     -Policy 'HK Test Delete after Aug07' `
     -AdvancedRule '{
  "Version": "1.0",
  "Condition": {
    "Operator": "And",
    "SubConditions": [
      {
        "ConditionName": "AccessScope",
        "Value": "NotInOrganization"
      },
      {
        "ConditionName": "ContentPropertyContainsWords",
        "Value": [
          "SignedBy:DocuSign",
          "SignedAtIPLocation:142.250.73.78"
        ]
      }
    ]
  }
}' `
     -AlertProperties '{
    "AggregationType":  "None"
}' `
     -AttachmentIsNotLabeled $false `
     -BlockAccess $true `
     -BlockAccessScope 'PerUser' `
     -Comment 'HK Test Delete after Aug07' `
     -ContentIsNotLabeled $false `
     -ContentIsShared $false `
     -Disabled $false `
     -DocumentIsPasswordProtected $false `
     -DocumentIsUnsupported $false `
     -EnforcePortalAccess $true `
     -EvaluateRulePerComponent $false `
     -ExceptIfContentIsShared $false `
     -ExceptIfDocumentIsPasswordProtected $false `
     -ExceptIfDocumentIsUnsupported $false `
     -ExceptIfHasSenderOverride $false `
     -ExceptIfProcessingLimitExceeded $false `
     -GenerateAlert 'true' `
     -HasSenderOverride $false `
     -MessageIsNotLabeled $false `
     -NotifyEmailExchangeIncludeAttachment $true `
     -NotifyEmailOnedriveRemediationActions 'NotSet' `
     -NotifyOverrideRequirements 'None' `
     -NotifyPolicyTipDisplayOption 'Tip' `
     -NotifyUserType 'Email, PolicyTip' `
     -ProcessingLimitExceeded $false `
     -Quarantine $false `
     -RemoveRMSTemplate $false `
     -ReportSeverityLevel 'Low' `
     -RestrictBrowserAccess $false `
     -StopPolicyProcessing $true `
     -NotifyUser 'LastModifier' `
     -NotifyPolicyTipCustomText 'Document Signed by DocuSign eSignature Platform from IP 142.250.73.78 can not be sent outside the organization.' `
     ;