to improve integration between FreeCAD and KiCad I developed a way to approximate BSplines in sketcher to Arcs (thanks to @wmayer for some improvements in FC) ... from that side I evolved my old macro Macro_DXF_to_Face_and_Sketch to add the ability to convert a shape or a dxf or a svg containing BSplines to a Sketch, where the sketch is obtained as an approximation of the BSplines to Arcs.
The new macro is included in the StepUp WB

This is also useful to convert i.e. a step model that has some spline to a 2D edge and then a Sketch for improve internal elaboration