How to display the subinventory locator address in new self-service?

Good morning, everyone.
I have the following request:
Display the subinventory location address in the new self-service for internal requests.
When I have the item balance in more than one subinventory address, the system automatically selects the address.
Questions:
Has anyone done this customization?
Can anyone explain the logic behind selecting the address, as it isn't displayed?
Thank you.