I don't think iOS has it from the app switcher, but pretty easy to take a screenshot and immediately select from it. (Or selecting from older screenshots or photos you open.)
Yes some of the best "AI" features Apple has implemented are related to picture search : you can describe what you want to find and it will consistently find it, even inside of videos with highlights or the moments you're looking for. Much less supposedly sexy than the SIRI AI / Apple Intelligence hype, but also much more useful