[Python] How to get all legends from a plot?

I have a Plot with 2 or more legends. How can I "get" all the legends to change (for example) the color and linestyle in the legend?

handles, labels = ax.get_legend_handles_labels() only gives me the "first" legend, which I added to the plot with plt.legend(). But I want the others legends too, which I added with plt.gca().add_artist(leg2) How can I do that?

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