Looks like Lovefield has the concept of a Column so you would also define a Column class. Your Table class would then provide a method to get a Column by name.
Next the docs you linked say that search conditions are defined on an interface called PredicateProvider which a Column implements. So I guess you would do the same in Java / JsInterop as well.
Untested, maybe there are other solutions, haven't done a lot with JsInterop yet:
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