Hi,
Looking at your domain model, it should not be too difficult to show the data. You have a 1-1 association from the Dashboard. So if you use logic to eg find the correct information and update the dashboard entity to set the association, you will be able to display it.
Here's an example using a combo box (that you could also use to select)
and an example using a text box
But it depends on you use case of what you need to show, you will have to select the appropriate logic.
Eg if you would like to display a list of employees based on the selection criteria in your dashboard, you will need to look a a completely different domain model structure.
Can I give you a suggestion along the way: Please take a look at the best practices for Naming conventions. Using _ in an attribute might get you confused because _ is used in associations.