CNC in Wordpress for AMP pages?

Question

Accelerated Mobile Pages

Hello, I decided to attach AMP pages to Wordpress myself without various plugins, I already figured out how to implement everything, but I got stuck on one thing, how to add an arbitrary CNC to existing posts.
For example, I want a page like domain.ru/name to also open with the url domain.ru/name/amp and, accordingly, return the amp variable. I googled about the CNC, I know about add_rewrite_tag (), and about the fact that with it you can make as many variables as you like on an arbitrary page, but I don’t understand how to adapt this function for ordinary posts.
Please tell me where to dig, how to implement this?

Answer 1

Well, the official AMP plugin from Automattic somehow implements this, look in the plugin code