The creator manual has excellent explanation of persistence data: https://developers.meta.com/horizon-worlds/learn/documentation/mhcp-program/community-tutorials/creator-manual#persistence
For your use case, it's not possible to persist the state of a world beyond the current instance, and each instance is independent from each other. If you want to preserve the transformation of an object, this can only be done on a per-player basis: using persistent storage to save on the player profile the position, rotation, scale, and other properties, in such way that when the player returns to the world you can read those variables to reconstruct what the player created the last time they were in the world.