Can we define a mapping in BPM approvals?

Summary:

We have a requirement wherein if the expenditure batch is submitted by certain users it has to routed to certain users for approval. It is a one to one mapping.

Per my understanding, individual rules can be set up but this requires us to create multiple rules. Is there any workaround for this?

Also can someone advice on another scenario wherein the batch submitted by certain users has to be routed to one single person. Can we maintain the list of users somewhere and call them while setting the rules?

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