GWT 2.8 RC2 with Polymer : Creating custom element using JsInterop

As in link here : https://vaadin.com/blog/-/blogs/using-polymer-elements-in-gwt-development

We are using JsExport annotation for creating and using/wrapping GWT element in polymer and  creating custom element. But I think 2.8 RC2 is missing JsExport. can you please provide me solution if we can built something like this using GWT 2.8. RC2?

Thanks,

Gaurav

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