Вы можете определить объект правила и найти оператор в ваших правилах как
var rule = [{ "state" : "AL", "product": "1", "statement": "s1"}, {"state" : "NY", "product": "2", "statement": "s2"}];
var statement = rule.find(c=>c.state == "AL" && c.product == "1").statement;
console.log(statement);
var rule = [{ "state" : "AL", "product": "1", "statement": "s1"}, {"state" : "NY", "product": "2", "statement": "s2"}];
var statement = rule.find(c=>c.state == "AL" && c.product == "1").statement;
console.log(statement);