Yes, you can add header rows for each instance of the table group. These headers are nothing more than a static group row inside the dynamic group. You may accomplish this using
CrosstabWizard: On the Choose Layout page select "Blocked layout, subtotals above". Subtotals are actually such static group. After finishing the wizard replace the subtotal expression with static header text. (Find attached screenshot)
Table designer: Insert row outside the detail group (find attached screenshot)