Double skin facade providing outside air to AHUs

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I don't think EnergyPlus has a direct way to do this.

If you have a side calculation to determine the facade-heated-outdoor air's drybulb, you could assign it to the OA inlet node using EMS actuator for Outoor Air System Node Conditions.

It might be considered thermodynamically similiar to use the return air feature in WindowProperty:AirflowControl. The heat gets added to the return air instead of the outdoor air, but only the fraction of heat gained that goes out the relief air is lost from the unit.

I agreed with @lutinfr answer. In IES, you created a separate zone to represent the air cavity. In the interior wall, you can set the interior wall as glazing material or whatever the actual material is. The air flow rate though the cavity can be specified as OA ventilation etc. Or you can create zero energy use fan or something like a dummy mechanical component to control the air cavity zone. Please see attached image.

I have not experienced this case in E+, I'm IESVE user. But I think the concept for getting this done is the same. As usual with double skin facade, I model cavity zones as thermal zones, separated them as individual thermal zone at each floor, cavities are connected vertically. In case I realize this for study, I separate them to 2 or even 4 at each floor to see roughly how the temperature gradient inside the cavity. Then using air net work on IESVE to connect them all and connect to AHU. Hope this can help.