If your use case requires this data in Funnel, you can request it as a custom connector.
Custom connectors and data requests are available only in Business and Enterprise plans.
Message Details Report
Dimensions
Campaign Name
Date
Date Created
Last Sent Date
Message Name
Message Category Name
Subject Line
URL
Metrics
Sent
Delivered
Bounced
Link Clicks
Gross Link Clicks
Opened
Gross Opened
Unsubscribed
How to request this data
To request Higher Logic data and other data that has not been covered here, submit a data request.