Currently, OutSystems Developer Cloud (ODC) does not have native support or specific components available to directly manipulate or add data to an existing PDF file. While traditional OutSystems platforms have Forge components like "PDF Toolkit" or "Aspose PDF" for handling such tasks, these are not compatible with ODC at this time.

The best approach in ODC might involve integrating with external services or APIs that provide PDF editing capabilities, such as Adobe PDF Services or any third-party API, via HTTPS calls. You'll need to manage API communication and handling external service responses.

If you're looking for guidance specific to the OutSystems Forge or documentation, it seems there’s no current ready-made solution for your request in ODC. You might consider submitting your feature request to the OutSystems Ideas forum.

Let me know if you need further assistance!