If your personal search engine supports the same url schema as Google/Bing/DDG, I see no reason why not: https://duckduckgo.com/?q=user+query+here&ia=web

If your personal search engine supports the same url schema as Google/Bing/DDG, I see no reason why not: https://duckduckgo.com/?q=user+query+here&ia=web https://www.bing.com/search?q=user+query+here https://www.google.com/search?q=user+query+here It's all generic enough to standardize, Apple could easily support a custom URL option like so.