Hi,
You can use something like
@startuml
class Address << (D,#FF7700) DataType>> {
house: String
street: String
}
@enduml
Using the preprocessor, you can also have:
@startuml
!define datatype(x) class x << (D,#FF7700) DataType>>
datatype(Address) {
house: String
street: String
}
@enduml

Is this what you are looking for ?