What's the issue?

Instead of sending AMP analytics requests to a fixed domain, we'd like to send to domain derived from am Analytics variable.
requests: {
endpoint: ${someVariable}
}
The issue is ${someVariable} always return an encoded string, while here an decoded string is needed.

How do we reproduce the issue?

<script type="application/json"> { "requests": { "pageview": "${documentReferrer}" }, "triggers": { "pageload": { "on": "visible", "request": "pageview" } } } </script>

In this case, https%3A%2F%2Fwww.example.com is returned instead of https://www.example.com

What browsers are affected?

ALL

Which AMP version is affected?

ALL