Way to add keywords in photos

As the tittle says, I am looking for options to add keywords for photos in photos app to organize them better in there. I know how to do that in macOS and that its not natively possible in IOS platform anymore. But is there a way to do it via some trick with automation or shortcuts? I know this is kind of wrong place to ask for this since it would not be fully automated. But I thought I could maybe export the files from photos to a folder in icloud until they have at least one keyword and then send them back to photos or something?

Main idea behind all this would be to get more organized photos cross all my apple devices. But I am mostly one the go with mobile devices (IOS) so the keyword tagging should be possible on that platform, otherwise I will never actually remember to do it in time.