You have to enabled "advanced user". Then on the "third-party" line you can select to block. Be forewarned that your browsing experience will default to a mid-1990s experience as you'll likely have no JS nor CSS since those are now often served by different domains. But for each domain you can now select which third-party sites to enable and then persist those settings. I have Firefox setup this way. In Chrome I have a default uBlock Origin install, so it is not so aggressive with filtering.
BTW, this custom filter rule seems to work around the LA Times blocker blocker. https://news.ycombinator.com/item?id=13567527