There is a command group 'az_eventgrid_system topic'. This group of commands could 'manage system topics'. The group of commands has global parameter '--debug' which means 'Increase logging verbosity to show all debug logs.'. The group of commands has global parameter '--help -h' which means 'Show this help message and exit.'. The group of commands has global parameter '--only-show-errors' which means 'Only show errors, suppressing warnings.'. The group of commands has global parameter '--output -o' which means 'Output format.'. The group of commands has global parameter '--query' which means 'JMESPath query string. See <a href="http://jmespath.org/">http://jmespath.org/</a> for more information and examples.'. The group of commands has global parameter '--subscription' which means 'Name or ID of subscription. You can configure the default subscription using `az account set -s NAME_OR_ID`.'. The group of commands has global parameter '--verbose' which means 'Increase logging verbosity. Use --debug for full debug logs.'. This group contains a child command 'az_eventgrid_system topic_create'.The syntax is: az eventgrid system-topic create --location
                                 --name
                                 --resource-group
                                 --source
                                 --topic-type
                                 [--tags]. The 1th example of the child command would be to use it to 'create a new system topic for storage account source', the syntax is: az eventgrid system-topic create -g rg1 --name systemtopic1 --location westus2 --topic-type microsoft.storage.storageaccounts --source /subscriptions/1b3b4501-23b9-4790-c31b-ddbd88d72123/resourceGroups/rg2/providers/Microsoft.Storage/storageAccounts/stgaccountname. The parameter '--location -l' is required. It is used to location. values from: `az account list-locations`. you can configure the default location using `az configure --defaults location=<location>`.. The parameter '--name -n' is required. It is used to name of the system topic.. The parameter '--resource-group -g' is required. It is used to name of resource group. you can configure the default group using `az configure --defaults group=<name>`.. The parameter '--source' is required. It is used to the arm id for the topic, e.g., /subscriptions/{subid}/resourcegroups/{rgname}/providers/microsoft.storage/storageaccounts/{accountname}.. The parameter '--topic-type' is required. It is used to name of the topic type.. The parameter '--tags' is optional. space-separated tags: key[=value] [key[=value] ...]. use "" to clear existing tags.. 