Perhaps a simple count for table rows

It's always a little daunting asking what is probably considered a simple question but here goes. 

I have a table of users of a product. The table is similar to this:

Date/Time   User name   Event           ObjectType 

Feb 1           John             CREATED     DOCUMENT

Feb 1           John             CREATED     DOCUMENT

Feb 2           Elaine           DELETED      DOCUMENT

Feb 3           John             CREATED      FOLDER

Feb 4           John             DELETED      DOCUMENT

I have a slicer (Activities) to which I have added the EVENT and OBJECTTYPE rows. I have another slicer with the USERNAMES. 

When I select a username, the Activities slicer shows the following, tailored to whichever username I select:

CREATED

      DOCUMENT

      FOLDER

DELETED

      DOCUMENT

How can I get it to add a count to the end? For example, if I select John, I would get:

CREATED

      DOCUMENT (2)

      FOLDER (1)

DELETED

      DOCUMENT (1)

I imagined I could just count up the number of rows that go to make up that output but I have no idea how. Again, apologies if this is incredibly obvious.