Go to "Team & Analytics" section on the skillboard.
Go to the "Insights" section.
Scroll down to the "Who has unique skills?".
You can use filter list of team members by their Skill level.
For example, consider levels higher than "Knows".
To change the setting in the filter, click on it and select a new setting in the context menu.
On the employee's card you can see the name and unique skills.