- job-template:
    name: 'test-job-template-{variant}'
    builders:
    - shell:
        echo "{repos}"

- project:
    name: test-project
    repos_common:
    - repo-1
    - repo-2
    jobs:
    - 'test-job-template-{variant}':
        variant: 'a'
        repos: !j2-yaml: |
            {% for repo in repos_common %}
            - {{ repo }}
            {% endfor %}
            - repo-a1
            - repo-a2
    - 'test-job-template-{variant}':
        variant: 'b'
        repos: !j2-yaml: |
            {% for repo in repos_common %}
            - {{ repo }}
            {% endfor %}
            - repo-b1
            - repo-b2