Extend search capabilities in Marketing Activities

Dear experts,

our ACS environment has to handle our organizational structure.

That's why we extended the meta data of elements like Campaigns, Services, Programs with some custom fields like "brand",...

Is it possible to extend the search bar under "Marketing activities" with some filters?

Beside, can the freetext search on top include/index the custom fields?

If it's not possible as an Administration configuration, may the Adobe support be able to code a special solution here?

Thanks, Greetz, Tommy