如何在Bokeh图中添加90度角箭头批注

from bokeh.plotting import figure, show
from bokeh.models import Arrow, NormalHead, Label

p = figure(plot_width=400, plot_height=400)

p.circle(x=[1, 2, 3], y=[1, 2, 3], size=10)

arrow = Arrow(end=NormalHead(fill_color="orange", size=10),
              x_start=1, y_start=1, x_end=2, y_end=2)

label = Label(x=1.5, y=1.5, text="批注内容", text_font_size="12pt",
              background_fill_color="white", border_line_color="black")

p.add_layout(arrow)
p.add_layout(label)

show(p)