how do I hide a zone-dependent field under certain conditions

[Josef Sigl]

I've created a field, called "customer Assignee" (type: zones Autocomplete Multi User Picker) and authorized it in "Field Security Schemes" for one customer and all internal employees.

This works perfect for the customer user.

But this field is always displayed for all internal user, also if it's a different customer and this is it what i want to hidden.

Is there a way to restrict the visibility of the field so that it is only displayed if it is customer ABC and for all other customers the field should not be displayed in the screen mask.
Like: If the customer "ABC" in field customer, then show the field, otherwise hide it

kind regards