Server-side javascript execution

Feature Request Summary: 

Zendesk Guide does not provide a way to render server-side Javascript on template pages. 

Description/Use Cases: 

We currently call third party apis that provide content on our template pages. To access those apis, we need an additional service layer. That service, which we've developed, would contain the authentication information used to access the third party services.  

Business impact of limitation or missing feature:

We currently have to develop add on solutions outside of Zendesk to help. We can't access third party apis directly, using client developed code.

Goal

Provide some way of doing server-side Javascript similar to NodeJS rendering would be so helpful! We could write server side javascript and process information from third party apis, all on the server-side, hidden from the client side browser.