Preconnect Custom CDN

hooks.php

add_filter( 'wp_resource_hints', 'preconnect_custom_cdn', 99, 2 );
function preconnect_custom_cdn( $urls, $relation_type ) {
	if ( $relation_type == 'preconnect' ) {
		$urls[] = [
			'href'        => 'https://fonts.googleapis.com',
		];
		
		$urls[] = [
			'href'        => 'https://fonts.gstatic.com',
			'crossorigin' => true
		];
	}
	
	return $urls;
}