One thing I always wished for is if there were a way to use duckduckgo bang searches in my browser without sending them through DDG. But apparently it's harder to implement than it sounds.
You can also create such bookmark manually and use %s in the url as a placeholder where search query should be placed.
The manual configuration can be useful when there's no direct search field. For example freshports.org allows querying freebsd.org. I can add a bookmark with search keyword "fp" to point to https://freshports.org/%S
After that I can type in address bar: fp lang/python39 to land on https://freshports.org/lang/python39 (the capital %S doesn't escape special characters like /)
(1) actually based on https://github.com/jivesearch/jivesearch/tree/master/bangs