You can't, but this is a GREAT reasons to have less playbooks and just
use task includes.
Handlers are also super easy to just put all of them into one file.
Hmmm ... a similar idea to the trick of replacing 'global_vars.yml' with 'group_vars/all'. It would clean our playbooks up a bit -- removing boilerplate that does not add anything to what the playbook is expressing.
K