How can the configured sample data package for a magento package be changed via ~/.n98-magerun.yaml?

.n98-magerun.yaml

# I want to change the configured sample data name for a given magento package.
#
# (Alternatively I would like to change the source URL for a sample data package.)
# 
# The following does not work as I intend it to.
# It adds a new record to the $this->commandConfig['magento-packages']
# array instead of overwriting the extra sample-data value.
#
# Can this be done?

commands:
  N98\Magento\Command\Installer\InstallCommand:
    magento-packages:
      0:
         name: magento-ce-1.9.0.1
         extra:
           sample-data: compressed-sample-data-1.9.0.0

It is now possible: https://github.com/netz98/n98-magerun/wiki/Magento-installer#add-own-magento-repositories

Thanks for the tip.