Wordpress: enable preview of .webp image files

functions.php

// Enable preview / thumbnail for webp image files. 
function display_webp($result, $path) {
    if ($result === false) {
        $webp_image_types = array( IMAGETYPE_WEBP );
        $info = @getimagesize( $path );

        if (empty($info)) {
            $result = false;
        } elseif (!in_array($info[2], $webp_image_types)) {
            $result = false;
        } else {
            $result = true;
        }
    }
}