Desktop widget-like window in React Native for Windows

Question

I want to start developing a desktop widget app (google calendar agenda) while I don't have any experiences with native app development. I'm a web developer, therefore I'm trying to do it in React Native for Windows.

I just sucesfully installed and launched hello world app in RNW according to insructions from https://microsoft.github.io/react-native-windows/docs/getting-started

Now I would like to remove the borders, title and buttons from the main window and make it transparent. I also wanto to remove opened app button from taskbar and have only app's icon in system tray. But here I'm getting confused and can't find any relevant documentation for this.

How could this be achieved?