Spice: plotting difference of voltages

Schematic Simulation (Ngspice)
1

Hello,

How can I plot with kicad+ngspice the difference of two voltages?
I know that with ngspice only in bash mode that I can write .plot(v(voltage2,voltage1)) to get the difference between voltage2 and voltage1. But this doesn´t works with the kicad simulator tool. With that tool I can only choose between automatically generated symbols. And I can´t find a way to change that.

It its possible to write plot instructions in the Eschemata?

Best Regards

2

Please have a look at Spice simulation: probing between two nodes
and Add differential signals Ngspice

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