Approval Rule where we use both serial and parallel in the same rule

Hello,

We have a requirement where a termination approval needs to achieve two levels of approval:

1st Approver = Representative, User 1, User 2 (Parallel Approval, First responder wins)
2nd Approver = User (Serial Approver, approval required)

When configuring the rule in Transaction Console, if we edit the approval participants to either serial or parallel, this applies to all approvers, however we need the final approval user to be set to serial so that after one user in the first group approves, it gets pushed to the second for their own approval.

I saw a question like this in Customer connect with a similar, but not identical, situation but cannot access any documentation provided under it.