Living here in the Western US, wildfire smoke is a major factor in outdoor weather. The US has very good models of wildfire smoke and there are several websites which make this available (in addition to NOAA itself), for instance https://bouldercast.com/colorado-smoke-forecast/
I'm a premium subscriber to Windy and I use it all the time, but this is a major omission for me!
I've seen previous discussion on here that was skeptical of adding this because the forecast product doesn't exist in all models. Not sure how that is relevant - the world is not homogeneous and parts of the world where wildfire prevalence intersects population density (like the Western US) will care more about it!
Windy already has plenty of products that are model-specific - "Low Clouds" for instance.
Please consider adding the HRRR smoke outputs.