how to use it on a shortcode/template?

Thank you for this plugin, it looks great, but how do I make it display?
Is there something like a shortcode or php code I can use?

$categories = get_the_terms( get_the_ID(), 'portfolio-category' );
if ( ! empty( $categories ) ) {
    echo esc_html( $categories[0]->name ); //this works!
    echo esc_html( $categories[0]->icon );  // nop
    echo esc_html( $categories[0]->category-icon );   //displays 0

}

Thanks again.
🙂

https://wordpress.org/plugins/category-icon/