One time, I need to remove old sites from Google Search Console. It's for my old outdated website, and I want people to find my actual website instead of the old one.
Go to Google Search Console and register your website.
You can also add a domain instead of a single URL.
You're going to need to add some HTML to the deployment or use other methods like adding a TXT record to your DNS.
After you verify your ownership, you can request removal.