Execute task when: "'Key' not in object"

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I have a playbook that’s creating n EC2 instances using exact_count. I’d like to tag those instances with a semi-meaningful Name value. I can get a list of all of my tagged instances from the ec2 module return value using {{ servers.tagged_instances }}, but…

I only want to apply a Name tag to those that don’t already have one.

  • name: Instances | Tag each instance with a name
    ec2_tag:
    aws_access_key: “{{ awscli.access_key }}”
    aws_secret_key: “{{ awscli.secret_key }}”
    region: “{{ aws.region }}”
    resource: “{{ item.1.id }}”
    state: present
    tags:
    Name: “{{ env_short }}-{{ ‘ws%02d’ | format(item.0) }}”
    with_indexed_items: webservers.tagged_instances
    when: “‘Name’ not in item.tags.keys()” # Untagged instances only

I’ve tried several variations of the when stanza, but nothing’s worked. Likewise, I haven’t found any documentation with an example like this. Is it possible?