Lock screen photos

I’ve read other questions about photos shuffling on the lock screen and I know there are only 50 that it will go through. I also know that you can set it up for pets, people, places, and nature. What I’m asking is, how do I select exactly which 50 photos it uses? I don’t see a way to set that up. Is it a possibility or it is not available. I have a iPhone 15 Pro Max with the latest updates.