expose acf

function expose_acf_to_rest() {

    register_rest_field('game_state', 'acf', [

        'get_callback' => function($post_arr) {

            return get_fields($post_arr['id']);

        },

        'update_callback' => null,

        'schema' => null,

    ]);

}

add_action('rest_api_init', 'expose_acf_to_rest');