It is possible to configure the OC to show asset crops in the asset list, alongside the original assets:
Ensure that you are using a child configuration of MM, exclusively used by the OC. See OC 5.4.0 2.1 Installation and Configuration for more info. If this is not done, MM will be affected too.
Find the search “DigiZuite_System_Framework_Search” in the newly created child configuration.
Remove the "asset.prevref" field from the search input.
Save the search.