is there any way to develop roku tv application not using brightscript?

I have some questions about developing a Roku TV application. I have my web application with HTML, javascript and java. I have read Roku docs already, but I couldn't find any way developing my application through WebView like Android TV. Actually I have no time to study brightscript and develop my application again...

So my questions are :

1. Is brightscript the only way to develop Roku TV applications?
2. Can javascript be used in brightscript?

Thank you for reading my question. I'm really looking forward to positive answers...:-(

For all of you question as of now, BrightScript is the only and only way for developing Roku applications. If you don't have time to study BrightScript, refrain yourself from developing roku applications.