At the current time it isn't supported. I have actually looked into it (http://lukemurphey.net/issues/1132) but it is difficult to support because it requires third-party libraries that Splunk doesn't include. Including third-arty libraries into Splunk is not trivial and is discouraged.
Thanks. I was pretty sure this was the case but I needed to hear it to make sure I couldn't make use of this before moving on to something more complicated. Incidentally your plugin seems pretty easy to use to scrape just HTML, so thanks for that.
Next up is using python and selenium to consume a scripted input.
I failed to mention that I implemented this in Website Input 3.0. I include Selenium and the Gecko driver within the app. You just need to make sure you have Firefox installed. It also now includes a new UI that makes creating the input much easier.