We imported changes from https://github.com/uBlockOrigin/uAssets/commit/5caa3f38d487e133eac48708a65fc99e8a5a8725
Does adding this (in brave://adblock, custom rules)
youtube.com,youtubekids.com,youtube-nocookie.com##+js(json-prune, playerResponse.adPlacements playerResponse.playerAds adPlacements playerAds, streamingData.adaptiveFormats.1)
youtube.com,youtubekids.com,youtube-nocookie.com##+js(json-prune, playerResponse.adPlacements playerResponse.playerAds adPlacements playerAds, playerResponse.streamingData.adaptiveFormats.1)
Though it may hit a youtube anti-advert bait