Add unfiltered_html Capability to Admins or Editors in WordPress Multisite

add-unfiltered_html-capability-to-admins-or-editors.php

<?php

/**
 * Enable unfiltered_html capability for Editors.
 *
 * @param  array  $caps    The user's capabilities.
 * @param  string $cap     Capability name.
 * @param  int    $user_id The user ID.
 * @return array  $caps    The user's capabilities, with 'unfiltered_html' potentially added.
 */
function km_add_unfiltered_html_capability_to_editors( $caps, $cap, $user_id ) {

	if ( 'unfiltered_html' === $cap && user_can( $user_id, 'editor' ) ) {
		$caps = [ 'unfiltered_html' ];
	}

	return $caps;
}
add_filter( 'map_meta_cap', 'km_add_unfiltered_html_capability_to_editors', 1, 3 );

For some reason the above didn't work, I think it might have something to do with the user_can function, or that I am using WP Multi-Site, or it doesn't work when using WP Gutenberg blocks. However the below does work for me with Gutenberg blocks on WP 6.4.3

add_filter(
	'map_meta_cap',
	function ($caps, $cap) {
		$user = wp_get_current_user();
		if ($cap === 'unfiltered_html' && !empty($user->roles) && (in_array('administrator', $user->roles, true) || in_array('editor', $user->roles, true))) {
			$caps = array('unfiltered_html');
		}
		return $caps;
	},
	10,
	2
);