How to Use Trunk Based Development for Long-Running Features

Sometimes teams have in their own requirements to develop something that requires time. I've seen that often branches are used for these purpose, basically feature branches. So if you want to use trunk based development for these long-running features, what should we do? We should do branch by abstraction. This is my contribution to the field of computer science in respect to trunk based development. You're doing your feature or you're refactoring or your tech debt item,. whatever it is that's going to take ages to do.