Add Attributes to block (WordPress)

add-block-attributes.php

<?php

global $wp_roles;
$all_roles = array_values($wp_roles->get_names());

register_block_type( 'block-restrict-content/block-restrict-content', array(
	'editor_script' => 'block_restrict_content',
	'attributes' => [
		'rolesSelected' => [
			'type' => 'array',
			'default' => [ $all_roles[0] ]
		],
		'roles'  => [
			'type'  => 'array',
			'default' => $all_roles
		]
	]
) );