How to write complicated conditions?

[KuribohG]

Suppose I want to write a script in OnUpdate event like:
if ((a && b) || (c && (d || e))) action();

In GameFlow, all what we can do is to AND or OR two conditions. But when we have more than two conditions, the operator priority is unclear.

So I think there should be conditions like AND condition or OR condition. For example, an And condition will receive two conditions as inputs, and its output will be the logical AND of these two inputs.

Or maybe I can implement this by myself, but I cannot get a evaluated boolean value for condition, since its OnEvaluate is a protected function.