How to add inList constraints into a variable from different class?

My inList constraints for a variable in class grew bigger. I need an alternative. One approach that I feel may work is having a list in a separate class and call that as an inList constraint. For instance, instead of

variable(nullable: true, inList:['Yes','N'])

can I do something like

variable(nullable:true, inList:domainClass.list)?

Any helpful hints will be appreciated.

variable(nullable:true, inList:domainClass.list)

That would only work if domainClass is the name of a class (since it begins with a lower case letter I expect it isn't) and list would need to be a static List literal. For example:

class SomeClass {
    static final List SOME_VALUES = ['Yes', 'N']
}

Then you could do something like this:

variable nullable:true, inList: SomeClass.SOME_VALUES

I hope that helps.