Front what I can see there is no option to allow a second line of text within an expand. I attempted to use wiki markup to do so and it is ignore due to it being rendered within the expand macro itself.
An option would be to create your own custom expand macro to allow for multiple lines.
More and more people are building their careers with Atlassian, and we want you to be at the front of this wave! Important Dates Start the Certification Prep Course by 2 April 2019 Take your e...
Connect with like-minded Atlassian users at free events near you!Find a group
Connect with like-minded Atlassian users at free events near you!
Unfortunately there are no AUG chapters near you at the moment.Start an AUG
You're one step closer to meeting fellow Atlassian users at your local meet up. Learn more about AUGs