[ros-release] bloom-release not adding the multiple packages…

This is a first-time release of a repo containing multiple packages (one of
them a metapackage).

bloom-release seems to be working well and finding the different packages,
but when generating the pull request to hydro/release.yaml it does not
create the list of packages automatically.

I get

sr_ronex:
    tags:
      release: release/hydro/{package}/{version}
    url: git@github.com:shadow-robot/sr-ronex-release.git
    version: 0.9.2-0

When I expect:

sr_ronex:
    packages:
        sr_ronex:
        sr_ronex_controllers:
        sr_ronex_drivers:
        sr_ronex_examples:
        sr_ronex_external_protocol:
        sr_ronex_hardware_interface:
        sr_ronex_launch:
        sr_ronex_msgs:
        sr_ronex_transmissions:
        sr_ronex_utilities:
    tags:
      release: release/hydro/{package}/{version}
    url: git@github.com:shadow-robot/sr-ronex-release.git
    version: 0.9.2-0

Is the normal behaviour of bloom-release that the user adds the list of
packages manually? Or it means that I did something wrong?