Are there any canon comic books that focus on the sequel trilogy era characters like Rey, Finn, or Poe?

Yes, there are several canon comic books that delve into the sequel trilogy era. For instance, the 'Shattered Empire' series explores the immediate aftermath of 'Return of the Jedi' and shows some of the early adventures of characters who would become integral to the Resistance. Additionally, various one-shots and limited series have focused on individual sequel trilogy characters, providing deeper insights into their backgrounds and motivations before and during the events of Episodes VII, VIII, and IX.