Setting the property globalMaxSize under brokerProperties ends with Invalid value: "array": spec.brokerProperties in body must be of type object: "array"

kind: ActiveMQArtemis
    apiVersion: broker.amq.io/v1beta1
    metadata:
      name: ex-aao
      application: ex-aao-app
    spec:
      deploymentPlan:
        image: placeholder
      brokerProperties: 
        - globalMaxSize=500m