Bicep - nested loop with module

main.bicep

param sbNamespaceName string = 'sbnamespace'
param topics array = [
  {
    name: 'topic1'
    subscriptions: [
      'sub1.1'
      'sub1.2'
    ]
  }
  {
    name: 'topic2'
    subscriptions: [
      'sub2.1'
    ]
  }
]

module servicebusTopic 'sbtopic.bicep' = [for topic in topics: {
  name: topic.name
  params: {
    topic: topic
    sbNamespaceName: sbNamespaceName
  }
}]

sbtopic.bicep

param sbNamespaceName string
param topic object

resource serviceBusNamespace 'Microsoft.ServiceBus/namespaces@2021-06-01-preview' existing = {
  name: sbNamespaceName
}

resource serviceBusTopic 'Microsoft.ServiceBus/namespaces/topics@2021-06-01-preview' = {
  name: topic.name
  parent: serviceBusNamespace
  resource serviceBusSubscription 'subscriptions@2021-06-01-preview' = [for sub in topic.subscriptions: {
    name: sub
  }]
}