Wordpress 支持自定义帖子类型wp api的特色图片

在wp api中自定义帖子类型的情况下，如何添加对特色图片的支持

我发现了下面的代码片段，它支持wordpress普通文章，但没有关于自定义文章类型的内容

function init() {
            add_filter( 'rest_prepare_post', [ $this, 'add_featured_image' ], 10, 2 );

        }
        function add_featured_image( $data, $post ) {
            $sizes        = [ 'thumbnail' => '', 'medium' => '', 'large' => '', 'full' => '' ];
            $_data        = $data->data;
            $thumbnail_id = get_post_thumbnail_id( $post->ID );
            foreach ( $sizes as $size => $src ) {
                $sizes[ $size ] = wp_get_attachment_image_src( $thumbnail_id, $size )[0];
            }
            $_data['featured_image_url'] = $sizes;
            $data->data                  = $_data;
            return $data;
        }

我明白了

过滤器应该是这样的

add_filter( 'rest_prepare_my_custom_post_type_slug', [ $this, 'add_featured_image' ], 10, 2 );