How to integrate uglify-es in grunt?

I'm using gruntjs (which uses uglifyjs) to build my Angularjs app. But uglifyjs still does not support es6, so in corresponding GitHub issue i found this. So now there is uglify-es, which seemingly supports es6. But I'm not sure how to integrate it with grunt. Now i have module "grunt-contrib-uglify", which has a dependency uglifyjs, which is now used. How can i make grunt use uglify-es instead?