EZScenery doesn't do api's.
For that you'll have do revert to one of the earlier design programs, like
Airport v2.6.
Another option is
SBuilder 2.05 which can handle both macro (api) and xml based objects, including the Rwy12 object libraries. In addition it does mesh, landclass, photo scenery, LWM and VTP, excludes and more. A 'Swiss Army Knife' of design for FS2004.
Dave
At that time [1909] the chief engineer was almost always the chief test pilot as well. That had the fortunate result of eliminating poor engineering early in aviation.