如何在另一个页面上添加WP-REST自定义字段？

How to realize following functionality by means of WP-Rest. It is necessary on other page (control of a plug-in, I write the plug-in), to remove select with custom post type, and after the choice, are updated below the field, in dependence of a post. If it is necessary, I can pay a small money for the help.

My code add custom field in WP-REST, but it doesn't work.

add_action( 'rest_api_init', 'create_api_posts_meta_field' );
function create_api_posts_meta_field() {

    // register_rest_field ( 'name-of-post-type', 'name-of-field-to-return', array-of-callbacks-and-schema() )
    register_rest_field( 'parsing', 'parsing_night_key', array(
           'get_callback'    => 'get_post_meta_for_api',
           'schema'          => null,
        )
    );
}

function get_post_meta_for_api( $object ) {
    //get the id of the post object array
    $post_id = $object['id'];

    //return the post meta
    return get_post_meta( $post_id );
}