How to set a double approval process to self service enroll a course/offering?

Summary:

 How to set a double approval process to self service enroll a course/offering?

Content (required):

Hi all,

we're implementing Learning module for a FSI customer.

They asking for a double approval process to self service enroll a course/offering that it has to be approved by Manager and Administrator HR for Courses and/or Offerings.

Going to (Admin view): My Client Group > Learning > Courses/Offerings > Selecting an exisiting course/offering > Manage Default Access > 

Under Learner Self-Service Settings we're able to set the approval process that has to be approved by Administrator HR.

How can I set the same process to be approved by the manager?