Fiducial Marker Based Localization System - Package Annoucement

How would one give the known pose of Aruco markers in an existing map and then use the fiducials localization system to localize the robot?

Background: We have an existing map (pgm) of our real-world environment. We would like to position specific Aruco markers in known locations in the real-world, record their poses relative to the map coordinates, and then somehow use the fiducials localization node to localize in the map.