Turns out I’m just a newbie at python;
check custom properties during blender fbx export
unreal py script, gotcha for me was the prepended FBX. convention.
import unreal
al = unreal.EditorAssetLibrary()
a = al.load_asset(“/Game/cubemeta”)
m = al.get_metadata_tag_values(a)
m[“FBX.meta_prop1”]