By design AppBuilder hybrid applications are built on top of the Cordova framework and as such they run in webview on the devices. This said, I am not sure that I fully understand your question. Could you please elaborate a bit more on what do you mean by "AppBuilder does not have a webview
Further, if you want to open a web page from within your AppBuilder application, you can directly use the InAppBrowser plugin and show it in the application's, the system browser's or the InAppBrowser's webview. If this is the case, I would suggest you to check the InAppBrowser sample
and the plugin's documentation
I hope this helps.