I want to pass the IoT custom endpoint as an env var to a lambda declared in [CDK](https://aws.amazon.com/cdk/).

I'm talking about the IoT custom endpoint that lives here:
[![enter image description here](https://i.stack.imgur.com/QHbEm.png)](https://i.stack.imgur.com/QHbEm.png)

How do I get it in context of CDK?