multi_tag.yml

- hosts: localhost
  vars:
    multi_tag: "iamanewkey:iamanewalue\nanotherone:yes"
  tasks:
    - name: Build tag list
      set_fact:
        tag_dict: "{{ tag_dict|default({}) | combine( {item.split(':')[0]: item.split(':')[1]} ) }}"
      with_items: "{{ multi_tag.splitlines() }}"

    - name: Tag a resource with multiple tags
      aws_tagging:
        resource: "resource"
        region: "us-east-1"
        tags: "{{ tag_dict }}"