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Reading the details you provided, I understood that you would like to show specific values for a field depending on the customer, please correct me if I'm wrong.
If that's the case, currently, there is no option to use dynamic fields in Service Desk. There is a feature suggesting this option:
You can create custom fields with specific values, but it will be available for all customers that have access to the project. It's not possible, for example, to show Option 1, 2, and 3 for Customer A and Option 4, 5, and 6 to Customer B.
If that's not what you meant, can you please give us more details about your use case?
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