How to automatically fill in location key using prepare mass additions automatically on Fusion Cloud

Summary: Is it possible in Cloud to use the Custom feature of programm 'Prepare mass additions automatically' as descrive in this document :" How to Set up Auto Rules for Automatically Preparing Assets During Mass Addition Process? (Doc ID 1545565.1)

If the rule to Custom is set :

The Prepare Mass Additions program uses the custom logic coded in the Public API fa_massadd_prep_custom_pkg.pkb. 

There is a need to overwrite the stubbed out version of fa_massadd_prep_custom_pkg.pkb (the package body only) with a hook. 

Development strongly recommends simply putting a call out from this package to user-own to avoid any core invalids / etc if any issues ever was ever to arise in their code. "