how to add vertical lines to the inner plots created by plot_topo?

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  • MNE version: e.g. 1.11.0
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I want to add vertical lines on the evoked response in plot_topo to mark events within each epoch. The fig object returned has just 1 axes and if I add to it it adds vertical lines to the topology instead of the data within each channel.

Is there an easy way to do it or should I plot manually?