You could use Plots.jl pyplot() backend with those specific annotation functions.
Otherwise you may use quiver! and annotate!, which work for several Plots.jl backends. A basic example follows:
using Plots; gr()
plot(sin, 0:0.1:2π, label="sin(x)")
quiver!([π + 1], [0.2], quiver=([-1], [-0.2]))
annotate!([π + 1], [0.3],"sin(x)=0")
