Audit Reports | How to apply data security rules

Summary:

One of our client requirements is to extend Audit reports capabilities to add,

1. Option to restrict Product LoV in Tools-> Audit Reports, based on the roles user assigned to.
2. Option to control audit data specific to Business Unit user having access to.

Content (required):

One of our client requirements is to extend Audit reports capabilities to add,

1. Option to restrict Product LoV in Tools-> Audit Reports, based on the roles user assigned to.
2. Option to control audit data specific to Business Unit user having access to.

I don't see any Audit Report related database objects available for us to create a custom data security rule.