LookUp sharepoint list with comboBox

[Olivereckes]

I got this List in Sharepoint:

I want to create something like a Support-Navigation, where workers can choose the "Aufgabenschwerpunkte" and get the person (which is in the List).

I already filled the comboBox with the data in "Aufgabenschwerpunkte".

Now i want to display the name, which has the right "Aufgabenschwerpunkte" in the List.

For example:

The worker needs help with Teams, so they choose Teams from the ComboBox. So it should display "Thomas Roth" 

Thanks in advance!

[Alex_10]

@Olivereckes 

Label.Text =
LookUp(SP_list, ComboBox.Selected.Value in Aufgabenschwerpunkte.Value).Mitarbeiter