There is a proposal to change the policy around how we create changelogs for ignition packages. The largest difference is that the changelogs will be updated at the time of release, rather than when a feature is merged ( the current procedure).

If we are doing this, there may be an opportunity to generate a changelog, much like how bloom does. This would be a reasonable reference for how bloom accomplishes this: https://github.com/ros-infrastructure/catkin_pkg/blob/master/src/catkin_pkg/changelog_generator.py