Well, not directly. When adding a keyword, I put it in the name of the bookmark in parentheses. Thus eg. https://news.ycombinator.com/newest is with the name "(hny) HN new" and keyword hny. When typing hny in the address field the bookmark comes up and I'll just tap it. You can also search only from the bookmarks.
DDG bangs is a nice feature. But feels neglected. No way to see a changelog and lots of old broken bangs. There is a form to submit new bangs suggestions but unclear if anyone reads the submissions or how the acceptance process works. No forum or other channel where users can discuss or upvote suggestions for new or changed bangs.
