Notify all workers on a task queue

Is your feature request related to a problem? Please describe.

User scenario:

My scenario:
I have multiple workers listening on the same task queue for high throughput.
All the workers need to do some setup and cleanup work from time to time.
My requirement:
the business client can send a workflow or a command, which can be picked up and executed by all workers, instead of only one of them.
Is there any solution?

Describe the solution you'd like
My strawman proposal is to have a metadata map that is returned as part of every workflow or activity task. An admin API should support updating this map. The SDKs should watch for map changes and execute appropriate logic to notify workers about the changes.