[Feature Request] Placeholder in Webhook Header

Description

Hi,

I've set up a Webhook Workflow using Ntfy. It is working as expected (after some try&error). Including Placeholder like {{doc_url}} in the Body. I tried to Optimize the Workflow and Look&Feel and put an Action Field in the Header as the Ntfy Documentation describes.

Actions: view, Open Document, {{doc_url}}; view, Open Paperless,

The Notification I receive include the expected Buttons. While "Open Paperless" opens a Website to my Paperless instance, "Open Document" just shows an error "Can not open {{doc_url}}", see also Tooltip in Screenshot. I'm assuming the Placeholder isn't processed/replaced before sending. Again, this is working in Body/Message. Not sure if this is a Bug or intentional. But I think it would be a nice Improvement.

<img width="352" height="264" alt="image" src=" />


Other

_No response_