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The idea has merit, as flow over the roof makes for low pressure, so hot air ducted by the A pillars would be sucked right out.
OTOH, as noted by others, the A pillars already have other jobs to do.
Better to vent the engine bay heat via hood vents, and/or side vents.
I've considered this in my Porsche, by making heat blanket envelopes around heat sources such as the exhaust manifold and turbo, then ducting their heat out through the sidewalls into the wheel bays, known low pressure areas. So, cooling air comes in through the nose stagnation point, flows past the hot manifold. then out the sides or top. Keeps heat from building up in the engine bay, so the intake manifold is not heat-soaked and the engine is fed cold, dense air to burn.
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