Añadir variación de bloque en Gutenberg.

block-variations.js

'use strict';
(function () {
	const {__, _x, _n, _nx} = wp.i18n;

	wp.blocks.registerBlockVariation(
		'core/paragraph',
		{
			name: 'paragraph-variation',
			title: __('Variación de párrafo', '_s'),
			icon: 'star-filled',
			attributes: {
				className: 'paragraph-variation'
			},
		}
	);

})();

functions.php

add_action( 'enqueue_block_editor_assets', '_s_loadVariationsScript' ); //Variations of blocks.
function _s_loadVariationsScript(){
		wp_enqueue_script(
			'_s-block-variations',
			get_stylesheet_directory_uri() . '/block-variations.js',
			array( 'wp-blocks', 'wp-i18n' )
		);
		wp_set_script_translations( '_s-block-variations', '_s', get_template_directory().'/languages' );
	}