"Add a comment" button

[toxinu]

Is there any way to have a snippet or javascript method which return an url to post comment on a service?
Something like:

<script src="embedd.js">
    {
        "url": "https://www.eff.org/deeplinks/2015/10/closing-loopholes-europes-net-neutrality-compromise",
        "add_comment_link": ["hn", "reddit"],
        "debug": true
    } 
</script>

Or any other way to add it.
And maybe another message when url is not found on a service, like, "Post this article on Hacker News to comment".