functions.php

<?php

add_action(
	'blocksy:pro:content-blocks:pre-output',
	function ($id) {
		if (! class_exists('\JET_SM\Gutenberg\Style_Manager')) {
			return;
		}

		add_action(
			'wp_print_footer_scripts',
			function () use ($id) {
				$inst = \JET_SM\Gutenberg\Style_Manager::get_instance();
				$inst->render_blocks_fonts($id);
			},
			9
		);

		add_action(
			'wp_print_footer_scripts',
			function () use ($id) {
				$inst = \JET_SM\Gutenberg\Style_Manager::get_instance();
				$inst->render_blocks_style($id);
			}
		);
	}
);