@User dc operating point can be annotated in xschem schematics. You need to do a 'op' analysis with ngspice and save all nodes. Then place annotator devices (devices/ngspice_probe.sym, devices/ngspice_get_value.sym, devices/ngspice_get_expr.sym, As already pointed out a good starting point is the n_diffamp.sch schematic which is included in the xschem_sky130 distribution under sky130_tests/ directory. In this schematic doing a 'ctrl-click' on the 'Annotate' symbol will show all voltages/currents next to the annotator symbols.