Maybe not exactly what you're looking for,
but check out Jared's method of placing
"images" onto a site mesh:
http://www.shoegnome.com/2017/05/19/archicad-site-models-images-meshes/
EDIT: You'll have to convert the 2D import as an image in order for this to work.
Marc Corney, Architect
Red Canoe Architecture, P. A.
Mac OS 10.15.7 (Catalina) //// Mac OS 14.5 (Sonoma)
Processor: 3.6 GHz 8-Core Intel Core i9 //// Apple M2 Max
Memory: 48 GB 2667 MHz DDR4 //// 32 GB
Graphics: Radeon Pro 580X 8GB //// 12C CPU, 30C GPU
ArchiCAD 25 (5010 USA Full) //// ArchiCAD 27 (4030 USA Full)