Add post formats for Jetpack's portfolio post type

post-formats-for-jetpack-portfolio.php

<?php
/**
 * Plugin Name: Post formats for Jetpack's portfolio
 * Description: Add post formats to Jetpack's portfolio post type
 * Version: 1.0
 * Author: Enej
 * License: GPL2
 */
function jetpack_portfolio_add_portfolio_post_formats() {
    add_post_type_support( 'jetpack-portfolio', 'post-formats' );
}
add_action( 'init', 'jetpack_portfolio_add_portfolio_post_formats' );