there is a letter after the position, I've never tried, but I think this sets the orientation. No idea if flipping is possible.

Thanks. I am trying to understand the way it works so that I can flip the macros for better routing.

this looks like a good place to start reading: https://github.com/The-OpenROAD-Project/OpenLane/blob/master/scripts/manual_macro_place.py

Thanks. It is what I am looking for.

@Peijun Hou can you check this

Get it