Change display text in matplot lib and scikit learn DecisionTreeClassifier

Question

I want to change the display text rules in leaf of my DecisionTree :

fig, ax = plt.subplots(figsize=(130, 40))

tree.plot_tree(decision_tree,
              feature_names=df_value.columns,
               class_names=["0","1","2","3"],
               filled=True,
               impurity=False,
               label='root',
               proportion=False,
               fontsize=38,
              ax=ax
              )
plt.show()

i don't know if it possible, i want to modify the "<= 0.5" (generated by scikit learn)