flags-a.yml

- config: flags-a
  flags:
    foo: 123
    bar: hello

flags-b.yml

- config: flags-b
  flags:
    foo: 456
    bam: bye

guild.yml

- include: flags-a.yml
- include: flags-b.yml

- operations:
    test-a:
      main: guild.pass
      flags:
        $include: flags-a

    test-b:
      main: guild.pass
      flags:
        $include: flags-a

    test-ab:
      main: guild.pass
      flags:
        $include:
          - flags-a
          - flags-b

    test-ba:
      main: guild.pass
      flags:
        $include:
          - flags-b
          - flags-a