OMP: display the editor role in the book landing page for monographs

Describe the issue or problem
We have monographs (NOT edited volumes) with editors but they are displayed as authors, i.e. without “(ed)” or similar (the label submission.editorName), so they seem authors even if they aren’t.
How to show the label submission.editorName only for them? In the template monograph_full the key is displayed only if the work type is edited volume…

Steps I took leading up to the issue
See for example this book
Maria Matilde Benzoni is the volume editor, how to display the role?

What application are you using?
OMP 3.3.0-13

Additional information