Line Art material properties not exposed to Python, have no versioning either

When opening files older than the Line Art feature, there is no versioning in place so you have to manually set the Levels property in order for the geometry to be detected at all by the Line Art modifier. But this can only be done manually going one by one through each material, because the properties aren’t exposed to Python I can’t make a script.

Any plans of exposing this to Python and/or adding versioning support for older files?