Administration Exchange local admins

Hellocf_2020 ! 

I dont think this is possible. 

There is a Geo-Administrator "role" that gives users administrator access of a certain geo location. But this role is only applicable for OneDrive and SharePoint. 

I believe that Exchange is not able to be managed in this kind of behavior. 

Your best bet would be to perhaps set up management scopes for each geo location and then add the admins to those scopes. 
This would in theory make it possible for them to only manage their locations users. 

Let me know if you need further assistance

Kind Regards
Oliwer Sjöberg