"One Thousand Levels Down" is a canon short story which is included in Star Wars Insider 151. It is written by Alexander Freed and is illustrated by Joe Corroney and Brian Miller.

It has also been collected in "Star Wars Insider Fiction Collection Vol. 1"

https://www.youtini.com/book/star-wars-insider-the-fiction-collection-volume-1

Two Alderaanians flee Imperial persecution on Coruscant following the destruction of Alderaan.