People want to get better at their chosen career and its your job as their manager to help them.
You can show the growth of the skillset of your direct reports.
You can show the growth of your direct reports and / or you can show the change of your direct reports to other roles within the company.
You have strategies of how to align employee career growth with the goals of the company.
Connect people with experts in your reports chosen field.
Understand what your direct reports want to accomplish with their careers.
Highlight areas of strength / weakness that can be used / strengthened to accomplish career goals.