How to make a 404 redirect from a subdomain to the main domain (Nginx)?

Question

Nginx

Hello! I have a subdomain set up on the server where I post my projects, and the Wordpress CMS system runs on the main domain. On the main domain, as you can understand, all pages with HTTP status are built by Wordpress, and on the subdomain they are built by Nginx. So: I would like the 404 status from the subdomain to be passed to the main domain, and ideally, the page would be taken from the main domain, but the URL would not change.
Thanks in advance!