I have used 1Blocker for years and it has worked great. There are many others all using the same principle. It also allows me to have a custom rule to disable JS entirely on some sites.

not as good as most desktop ones but:

https://apps.apple.com/app/ublock-origin-lite/id6745342698

other options: https://fmhy.pages.dev/mobile#ios-adblocking

There’s lots in the App Store.