Webforms is push-button feature that doesn't allow for much customization. Google analytics tracking is not available for webforms. If you need this or other advanced features you can always create your own form and submit content to an app using our API. This does of course require some knowledge of programming.
If you cannot work with the API yourself you can always contact one of our technical partners who will be happy to help: https://company.podio.com/partners-find
All the best,