Adding immutable data possibility to client.submit()

Hi!
it would be very kind if someone think about adding the possibility to set data arguments for client.submit().

expected behaviour:
- Data set as immutable must not change while computation (dependency)
- Data set as immutable are distributed to all workers in "computation setup" (only once)
- Data set as immutable are reused for following computations on the same worker until all computations of the same kind are done

Maybe I'm using dask wrong or haven't found the correct page in the documentation, if so please give me hint.