The UBlock Origin Lite app (currently in Testflight beta but seems to be full, but hopefully coming to the app store soon) works great with iOS Safari. I use that on iOS and Firefox on the desktop, which turns out to be a great combo if you have password and bookmark management separate.
Firefox Focus is also great as the default browser on the phone to avoid links opening from Meta or Google in Safari.
Running the «Always in Container» extension in Firefox gives the same effect on desktop and avoids opening a link in the wrong container. Highly recommended: https://addons.mozilla.org/en-US/firefox/addon/always-in-container/
Installs as a Safari Extension, so I believe it is only for Safari and not for the «webkit core» itself that all browsers on iOS use.
Another option is the Orion browser from Kagi that supports desktop extensions like Ublock Origin.