How to create a CALLOUT in a DIGGER

Hello

Within my general assembly, I want to make sub-parts appear in the form of DIGGER (ZOOM and another in the form of X-ray). The idea is to annotate the DIGGER with the numbers corresponding to the nomenclature.

Does anyone know how to integrate a callout into a DIGGER? Ideally, I would, of course, like it to be automatically linked to the room.

Thank you in advance