I add the rules in .gitattributes as below.
changelog.txt merge=union
It works well on my local. But it didn't work when I create a pull request on the Bitbucket website.
I saw there are some same questions on community. So you don't have implemented this feature yet?
Is there any other way I can try? Because this file needs to be changed frequently by multiple people, it is very easy to conflict. My team members are annoying it.