I came across these terms reading about 'the three natures' which is a yogacara teaching that is similar to the two truths in my understanding. I would say that it has dependent origination as a 'nature' that bridges fabrication to the unconditioned Buddha nature.
I had heard of ontology and epistemology before in western philosophy and my understanding is that ontology is about what reality is versus epistemology is how we 'know' reality.
So the example I found in my pan Buddhist dictionary in the T section was Tris-svabhava nirdesa is a work by Vasubandhu talking about the Three Natures Doctrine and he argues that it should not be considered so much as philosophical idealism because it deals with epistemological matters.
And also yay I created a topic which I rarely do!