Man...
There is no pre-defined thing for something like an "Entity". Its opensource library for all kinds of shit not just for 3DGS.
If you really want to do this then send the whole struct data of the entity and a byte infront of it to dertiminate what you want to do with it (something like the packet id, 1 == create entity, 2 == delete entity and so on)
I guess you should just pay the little money to get a good working plugin...