如何从GUI捕获数据

I'm coding simple app and I use Golang for this purpose. Nowadays there's no exact way to create GUI, so I have to load one of libs - webview. So as far as I understood, I can trigger actions from front-end using JS external.invoke('eventName').

Also I can push data from back- to front-end using Go

simpleJS := ``console.log("`` + myVar + ``") w.Eval(simpleJS)

(there ` should not be doubled)

So the question is how can I get data from JS. As I understand trigger have only its name, not more. As closest probable solution I decided to stringify wrap of eventName + data and parse it on Backend