plot_causal_tree can't show the significance level p

Now CausalTreeRegressor and trees in CausalRandomForestRegressor class can be plotted with the information about the treatment and control sample sizes that were used to build a tree. See from https://github.com/alexander-pv/causalml/blob/d1b841f64814bb01ce513c09f0ce98703a19572a/causalml/inference/tree/plot.py#L324, but this tree does not show the significance level p. 