Audit all insert, delete, update and select statements on a schema in Oracle 12.2

I cannot understand how to create a Unified Audit policy in order to audit all INSERT, UPDATE, DELETE and SELECT statements performed on all the objects within a specific schema.

The goal is to track the tables and views involved in a specific PL/SQL procedure for a reverse engineering task.

For what I understood from the documentation, the only option is to specify each table/view to track within the policy. Is there an "audit all objects within a schema" construct for the create audit policy statement?