The x − y slices of the magnetic field configuration, taken at different z-plane positions. In each slice, the contours represent the poloidal magnetic field component (B_p), while the toroidal component (B_ϕ) is shown using a colormap (in μG). Together, these components provide insight into (a) the dynamic characteristic of magnetic field structures within the jet–cocoon system and (b) their individual contribution to the features seen in polarization maps (Fig. 12). Additionally, the variation across z demonstrates the non-axisymmetric bulk motion of the jet beam in three dimensions, emphasizing the limitations of employing a 2D model. To aid comparison of the field configurations within each group, red dashed lines have been added as visual guides to the reader.