Using vars in a rulebook similar to playbook

vars_example.yml

---
- name: Vars in rulebook
  hosts: all
  vars:
    person:
      age: 45
      name: Fred Flintstone
      active: true
      reliability: 86.9
      address:
        street: 123 Any Street
        city: Bedrock
        state: NJ
        years_active:
          - 2001
          - 2002
          - 2003
          - 2004
  sources:
    - generic:
        payload:
          - name: Fred Flintstone
            address:
               street: 123 Any Street
               city: Bedrock
               state: NJ
          - year: 2003
          - active: true
          - threshold: 34.56
          - age: 45
  rules:
    - name: str_test
      condition: event.address.street == vars.person.address.street
      action:
        echo:
          message: String comparison works
    - name: list_test
      condition: event.year in vars.person.address.years_active
      action:
        echo:
          message: List in works
    - name: bool_test
      condition: event.active == vars.person.active
      action:
        echo:
          message: Boolean works
    - name: int_test
      condition: event.age == vars.person.age
      action:
        echo:
          message: Int works
    - name: float_test
      condition: event.threshold < vars.person.reliability
      action:
        echo:
          message: Float works