So, I check the previous big update(The Chronicles) and find these kinds of things, but they seem only work in AGE tool, no any way to modify through the in-game triggers. Are these just for modders to modify in AGE but no way to use in triggers, right? Have anyone successfully done with triggers only to achieve custom tech by using the flags added?
Source: Age of Empires II: Definitive Edition - Update 128442 - Age of Empires - World's Edge Studio