how to display custom properties in ObjectSelect Options

[boedociclon]

Hello, I integrated your CsnUser Module in my application; I have a Customer Entity which has a OneToOne association with CsnUser Entity. I would like to show properties username and role inside dropdown option using just annotation. I figured out I could add a method __ToString() to CsnUser Class that returns custom string and add annotation @annotation\Options({"target_class":"CsnUser\Entity\Role","property": "" }) to my Customer Class but I would prefer not to alter CsnUser Module code.
Do you have any suggestion to obtain same pourpose without alternig original code?
Thank you very much for helping.
Best regards.