Is it possible that we can assign approvers dynamically to the Human Action

Summary:

Suppose if there are 4 level approvers reviewer 1 is not null then it will go assign and sent the notification to the approver and if reviewer2 is null then it will skip and assign to the reviewer 3 and then if approves it will go to the reviewer 4

so the approvers details (reviewer 1 to 4 ) these details will come from DB tables and From VBCS pages the user can select any of the approvers form reviewer1 to reviewer4 and that will store into the DB in this we don't know whether which reviewer value will be null.

and also threshold also selected Dynamically based on the dynamic thresholds and dynamic approvers need to capture in THE pcs