Question: What was the gift to Chewie at the end?
Phaneron
17th Mar 2020
Star Wars: The Rise of Skywalker (2019)
Answer: It's a medal similar to the ones Han and Luke received at the end of "A New Hope." Whether it's a new one, or Leia was in possession of one or both the medals that belonged to Han and Luke respectively is unknown.
It is Han's medal which Leia had saved. It says so in the novelization.
17th Mar 2020
Answer: I believe you are talking about the medal. That is one of the medals from the end of A New Hope (Star Wars) that was given to Luke and Han. Presumably it is Han's medal.