Question about creation a big multiplayer game using Cocos Creator and Colyseus

Hi all, I am wondering, how can I create multiplayer game like this using Cocos Creator and Colyseus?

The question is, if I create very big beauteful level with a lot of physics objects, colliders and triggers, how to move all this data about physics and colliders to back end side? to check physics there and prevent wrong synking for players.
There will be a lot of physics objects and interesting triggers I can put using Cocos Creator editor. But how then move all this stuff to back end it can create physics world there and just send players the positions, rotations and other stuff for render.