When setting up approvals, you can choose approvers for your customers by setting up a pre-set list of approvers.
By default, your project comes with the Approvers field that you can use for approvals. If you want to use a different field, see Add a new custom field to a project.
Make sure you've followed the steps to allow customers to choose approvers.
To set up a pre-set list of approvers:
Add a user picker custom field to the request.
Next to the field, click Actions > Hide.
Enter the users who can approve the request, then click Set. The approvers will display in the issue and are notified when the request needs approval.
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