perch_shop protected:field question...

I'm trying to this in my cart template:

<perch:if id="manual_checkout_promotion">

Do this...

</perch:if>

where manual_checkout_promotion is a field I created in my promotion.html template. It doesn't seem I have access in the cart to check against it.

So I tried to call the cart this way so see if it was there:

                            $testcart = perch_shop_cart([
                                'raw' =>true,
                                'skip-template' => true,
                                'return-html' => true
                            ],0);
                            print_r($testcart);

and all the fields for promotions (except the the title of the discount_code) have :protected as part of their name. I see the field I'm trying to check in this section of the array:

            [details:protected] => Array
                (
                    [promoID] => 5
                    [promoTitle] => Offline Credit Card
                    [promoDynamicFields] => {"title":"Offline Credit Card","description":{"_flang":"markdown","raw":"Manually Entered Credit Card Purchase","processed":"
Manually Entered Credit Card Purchase<\/p>"},"from":"2017-05-20 07:45:00","to":"2028-05-20 07:45:00","active":"1","manual_checkout_promotion":"manual","action":"discount_by_percent","discount_code":"OFFLINECC","amount_percent":"0","amount":{"142":"","_default":""},"trigger_value":{"142":"","_default":""},"max_discount":{"142":"","_default":""},"max_uses":null,"customer_uses":null,"terminating":"0","persistent":"0","priority":null,"apply_to_shipping":"0","shipping_methods":null,"categories":null}
                    [promoFrom] => 2017-05-20 07:45:00
                    [promoTo] => 2028-05-20 07:45:00
                    [promoActive] => 1
                    [promoOrder] => 1
                    [promoCreated] => 2017-07-04 11:46:24
                    [promoUpdated] => 2018-09-18 09:43:52
                    [promoDeleted] => 
                )

Is there a way I can check the value of that field?