Allow to select sync target based on staleness time in Chained Replication

Issue,
Chained Replication is enabled by default in all supported MongoDB Server releases, and this means that a SECONDARY might select another SECONDARY as a sync target with large replication lag but very low ping time.

Metadata,

• MongoDB Server version: v. 4.0.X, v. 4.2.X, v. 4.4.X, v. 5.0.X

What we need from this SERVER ticket,

• Can we consider enhancing Chained Replication feature by adding ability to configure sync target based on staleness time?
  • Here is the diagram to describe the proposal,
    

Thanks in advance,
Alexey