Rotation fine control with position

Hello,

coming from tikz, I am missing the fine contol to specify the origin of the label rotation or position to work on the rotated label.

At the moment `3.1.0`, `position` and `rotation` do not work together (in the sense they don't know of each other).

Position works on the un-rotated label and rotation only happens around the center of the label.

Either, we need an option to specify the center of rotation of the label, i.e., all 8 nearest-neighbors connectors (top left, top center, top right, left center,...) + center.

Or we need position to actually work on the rotated label, otherwise a rotated label is impossible to align well (manual approaches are not good for responsiveness).