Because you must configure the google-storage-v2 provider with parameters specific to your account (but can leave all other parameters with the recommended values), if you choose to use the cluster-google-storage-v2 template, your binarystore.xml configuration file should look like this.
<config version="2">
<chain template="cluster-google-storage-v2"/>
<provider id="google-storage-v2" type="google-storage-v2">
<endpoint>commondatastorage.googleapis.com</endpoint>
<bucketName><BUCKET NAME></bucketName>
</provider>
</config>