Integrate insulated attic into KWL

Hello everyone,
I am building a passive house, so a mechanical ventilation system is a given.
I am building diffusion-open, so humidity is not an issue that needs to be considered.
I have an attic (1.2 m high) that is within the insulation layer.
Unfortunately, my planner is no help to me, so here is the question: does / should the attic be integrated into the ventilation concept? What speaks for this? Are there compelling reasons that I am currently not seeing?

Thank you in advance for your answers.

Sure that the attic is insulated? I know from well-insulated houses that the above-roof insulation runs over the attic, but the insulation between the rafters follows the ceiling/collar beam to minimize the surface area. The attic roof is then not completely outside, but also not really within the thermal envelope. I would not include it in the [KWL], since the air quality there is absolutely irrelevant.