Append to variable in dependencies

[Tomasz Klosinski]

Hello Ansible Community, 

I have a role for kibana in which I add a dependency to yum role that configures yum repos:

roles/kibana/meta/main.yml:

---

dependencies:
  - role: "yum"

    yum_dependencies:
      - name: "kibana"
        description: "Kibana-$releasever - $basearch"
        baseurl: "https://mirror.blabla.de/yum/kibana/4.4/centos/"

Then I have another dependency in elasticsearch role:

roles/elasticsearch/meta/main.yml:

---

dependencies:
  - role: "jdk"
  - role: "yum"
    yum_dependencies:
      - name: "elasticsearch"
        description: "Elasticsearch-$releasever - $basearch"
        baseurl: "https://mirror.blabla.fr/yum/elasticsearch/2.x/centos/"

What can I do to append the yum repos variables to yum_dependencies list instead of overwriting it? Is it possible in this case? 

Thanks in advance for any help and suggestions!

Best regards,

Tomasz Klosinski