This isn't possible on Youtube right now. The automatic tools for detecting LLM-generated content have far too many false positives. And obviously no one is going to pay an army of people to curate the content. The best thing right now is to rely on the reputation of individual channels that you are personally familiar with.

Youtube's automatically applied label will be worse than useless unless they've made some remarkable breakthrough, which I doubt. They'd be better off just using creator-applied labels, and of course if they would label anything that Youtube itself contaminated with automatic translations or its ilk, that would be good too.