Can the "One Click Approval Server Host Name" field have some hostnames?

Document ID : KB000116912
Last Modified Date : 04/10/2018
Show Technical Document Details
Is there the way to register a few IP address to the below settings? 

   Settings >> Credential Manager >> Email Settings tab >> "One Click Approval Server Host Name" field 

The reason why I ask is that I would like to make users access from both LAN(Local IP Address) in house and the Internet(Global IP Address). Then, the user can access the target server from the iPhone when the user is out of the office.
It is not possible to set some URL to the "One Click Approval Server Host Name" field. 
However, if it implements the PAM clustering and set the VIP to the field, the one click approval feature should be worked even if the user is both inside and outside of the office.