Stackdriver Trace [1] is Google's external implementation of Dapper with additional analysis features. It's available for free, even for workloads not running on Google Cloud Platform.
(Disclosure: I work on it)
(Disclosure: I work on it)
It doesn't show zipkin configuration :)
If you scroll down you'll see a top-level header also titled "Configure Zipkin tracers" that describes how to configure the Brave tracer. You don't really need to do anything special here - just point your Zipkin tracers at the Stackdriver Zipkin Collector rather than your existing one.