Pocketmine 4.0.0 Entities

So I was working on entities and i wanted to save custom data that i can access even after restarts, but I can not find anyway to do so in 4.0.0 update.
Is there anyway to do so in this update??
thanks in advance.

 

So, you wanna to get Position and type when server restarts?
P.S. if it's true then you should do task and save entities in config.

 

Why task uh ~-~

What do you mean by saying "Custom data", you could try to add a new NBT tag?