How we declare 'ssh_args' when use ansible api

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even though, we can defined ssh_args in ‘options’, but play_context still use default defined of ‘ssh_args’ ,
_ssh_args = FieldAttribute(isa=‘string’, default=C.ANSIBLE_SSH_ARGS)

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get ssh options FIXME: make these common to all connections

for flag in [‘ssh_common_args’, ‘docker_extra_args’, ‘sftp_extra_args’, ‘scp_extra_args’, ‘ssh_extra_args’]:

setattr(self, flag, getattr(options,flag, ‘’))

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https://github.com/ansible/ansible/blob/devel/lib/ansible/playbook/play_context.py#L288

So how we declare ‘ssh_args’ when we use ansible API ?