How create list or array of custom data type for hardcoded values in expression rule

I want to write expression rule VM_getAllCustomers which will return hardcoded customer values. I tried below

'type!{urn:com:appian:types:VM}VM_Customer'(firstName: "Pravin", lastName: "Sawant")

This gives single record. I want list of Customers, What is syntax for list of Customers.

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