How to have a custom domain to exact article?

I have set up a custom domain using Cloudfare, I can now route from the custom domain to intercom article. I was wondering how do I route via my custom domain to an exact article:

example custom route: 
somesite.com/support

will go to:
https://intercom.help/someintercom

How can I do it so that I can go from:
somesite.com/support/some-article

To my actual intercom article:
https://intercom.help/someintercom/en/articles/some-article