i'm aware of transferable objects, but it really defeats the purpose of parallelizing analysis of the same thing if that thing becomes unavailable to read after

i'm aware of transferable objects, but it really defeats the purpose of parallelizing analysis of the same thing if that thing becomes unavailable to read after transfer. it would be great to just tell a worker to read a specific bounding box from an existing canvas without having to give up the canvas entirely or copying the bounding box contents into it.