How to use only grep to find files with specific filename? [closed]

1. I'm using GNU bash (v 5.1.16), grep (GNU grep) 3.7, Ubuntu 22.
2. No piping or any other tool allowed
3. I don't want to search the file's contents but only need to find files with matching filename.

I know that it is easy to do with "find" command or multiple grep command like

"grep -rl "" . | grep "<filename>"

But i want to do it in single command without any other tools help. Also tried this question but couldn't find answer that satisfies the mentioned conditions.Thanks.