If the data is coming to the Pipeline from the Outlook channel, it should come already in json format that the Pipeline can read and you'll then pull the elements from that by their name. I don't think I've seen .json in the name declared.
This has been solved without the use of Jinja, Have a look at these posts:
Outlook Email with Attachments in Pipelines | Qrew Discussions
Can an email attachment be saved to Quickbase using a pipeline? | Qrew Discussions
This unfortunately has nothing to do with outlook :(. Basically I am trying to grab the generated document template and have a pipeline that pushes it to the record's attachment field. That way the user doesn't have to download the pdf first and import to the record
