I recently switched from iPhone to Android, and let me tell you it is ridiculous how much more control you have over your user experience. Adblock alone made it worthwhile.
Anyway, on iPhone i used to use reader mode to filter all that crap. Though some asshole sites block the function
Just dug around the Safari settings on my (fairly old) device, i cant seem to find any extensions or addons. Though i believe you of course, a quick web search suggests so too. Perhaps my device isnt supporting them, its an old iphone x i think (or 8?)