Limit FeatureImpactPlot to the most n important features

FeatureImpactPlot allows to plot the impact of the feature values. In my case I have about 100 features and 3 classes. Therefore, I get an unreadable and cluttered output for all features.

The fname parameter can be used to limit the plot to single or multiple features.

However, I am sort of asking the other way around:
Does anyone have an idea how I can limit the output to the n most important features?

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