Now I can import some local JS files. That is very good, but what if I want tu use some remote CDN? For example <script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.4.9/angular.min.js"></script>
If you look at the design panel on RHS of screen you will find that if you hover over js section and right click on mouse you will be able to link to external js file
Hackers_84 nailed it.
Right click -> Create New, Import, Link External
Definatelly I was blind :(