How to Bulk Assign "Service Request Approver" to users mentioned in CSV

How to Bulk Assign "Service Request Approver" to users mentioned in CSV

Dear All,

We have 500+ Approvers in our organization. 
We have to modify each and every person manually for assigning "Service Request Approver" role.

This is not easy task for 500+ Approvers.

Please give us the method to update the approvers by importing CSV File.

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