Whitelist specific sublinks and sublinks of the sublinks of blocked url

For the chrome extension it would be helpful if one could block the YouTube website, except some channels and their videos. When I study there are some channels that are very helpful but YouTube entirely feels very distracting. Also if that might be quicker to fix blocking specific YouTube channels would also help. As there are some channels that make up most of my distraction. Currently it’s only possible to block YouTube entirely. With no exception or ability to block specific channels.