The current version of zabbix helm chart supports adding custom RBAC rules, however this does not work. The problem is on this line: https://git.zabbix.com/projects/ZT/repos/kubernetes-helm/browse/templates/cluster-role.yaml#50

The line should be changed to this to fix the issue with indentation: 

{{ toYaml . | indent 2 }} 

Steps to reproduce:

1. add this to you value.yaml file: 

    rbac:
     create: true
     additionalRulesForClusterRole:
       - apiGroups: [ "" ]
         resources:
           - persistentvolumes
           - persistentvolumeclaims
         verbs: [ "get", "list" ]

1. apply changes with `helm upgrade -f values.yaml`

Result:
Error: UPGRADE FAILED: YAML parse error on zabbix-helm-chrt/templates/cluster-role.yaml: error converting YAML to JSON: yaml: line 51: did not find expected key
Expected:
helm upgrade to finish successfully.