Safari Search Engine Options
Is there really no way to add to or delete from the list of available search engines in iOS/iPadOS settings for Safari?  When I go to Settings -> Safari -> Search Engine, I see options for Google, Yahoo, Bing, DuckDuckGo, and Ecosia, but no way of adding another or deleting existing entries.  Other browsers, like Brave and Firefox, allow you to add just about any search engine you like.
iPhone 12