FastLane: is there a way to generate android/iOS build from a remote branch in bitbucket?

Question

I am planning to use FastLane instead of Jenkins, as FastLane focuses mainly on Android and iOS projects.

I couldn't find any documentation in FastLane to generate Android/iOS builds (apk or archives) from a remote branch in BitBucket.

Their documentation specifies how to make a build from the project present in our system. I wanted to generate a build without importing that project remotely.

Is there a way in FastLane to generate android/iOS build from a remote branch in bitbucket?