No clue on that one, sorry. I’ve been using Purify[1] for ages, but have no clue if it blocks JS - I suspect it blocks only some JS, because my experience of the web isn’t trash while using it, but I do have to disable it sometimes to use the heavily animated navigation systems that some sites implement.
[1]: https://apps.apple.com/us/app/purify-block-ads-and-tracking/...