Option to select "Auto merge when build test passes"

Hi,

We've recently moved from Gitlab and are really missing one of the features it had which allowed you to automatically merge on successful build. It meant that if we were given code reviews and it's passed everything visually, we don't need to sit around waiting for 30 minutes for a build test slot to be available to test the commit against the branch. It's okay during the day, but when you get a code review at 6.30pm you don't want to still be hanging around at 7pm waiting to see if the build was successful so that you can push a button to merge it. 

Is there a way of setting this up in Bitbucket? We've searched for some plugins or information but can't find a way to set this up.

Cheers,

Amanda