Print MorpthTo relation in table widget

Hello everyone!
I have a problem to print a morphTo relation.

I have a Notes table with this structure:

ID | coverable_type | coverable_id | text | highlighted
1 | App\Models\Appointment | 1 | Hightlighted text | 1
1 | App\Models\Appointment | 1 | Text not highlighted | 0

I need to show in dashboard, with a table widget, only highlighted notes.
As you can see from the attachments, the model column is empty.

What am I doing wrong?

Thanks in advance