how can i access to the JSON objects in crowd-checkbox of mturk with cloud templates?

问题

I want to check if the right answer is checked among many checkboxes on Mturk Survey (to validate the participant reads the instruction). I looked at the reference, but I am struggling to find how to access the boolean value of "checked" https://docs.aws.amazon.com/ja_jp/sagemaker/latest/dg/sms-ui-template-crowd-checkbox.html

<div><crowd-checkbox name="Stop"> Red </div>

Let's say I want to access "Stop" value.

How should I call the value in the function?

来源：https://stackoverflow.com/questions/54596216/how-can-i-access-to-the-json-objects-in-crowd-checkbox-of-mturk-with-cloud-templ