How to fetch the delegation original approver manager name?

Summary:

We have a requirement where we need to fetch the expense report's original approver's manager name from the approval workflow.

For example, if A has submitted an expense report

Approval will go to its Line Manager X. But Line Manager X is on Vacation and he/ she has created a vacation rule.

Now We need to check if the task delegated is to the Manager "X"

Line Manager or not.

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