How to import and use JsInterop with LibGDX (Gradle)?

Question

I cannot figure out how to import and use JsInterop in a LibGDX project.

My GWT version in html build.gradle is correct:

gwt {
    gwtVersion='2.8.0'
...

In project's build.gradle :

project(":html") {
    apply plugin: "gwt"
 ...

    dependencies {
       ...
        compile "com.google.jsinterop:jsinterop-annotations:1.0.1"
    }
}

Still I cannot compile, I get errors:

error: package jsinterop.annotations does not exist
error: cannot find symbol class JsType

I have read about the generateJsInteropExports flag, I tried to put it in different places (maybe wrong ones?), did not work either.

Am I missing something?