Showing equation of nls model with ggpmisc

[MYaseen208]

R package ggpmisc can be used to show equation of lm model and poly model on ggplot2 (See here for reference). Wonder how to show nls model equation results on ggplot2 using ggmisc. Below is my MWE. Any help will be highly appreciated. Thanks

library(ggpmisc)
args <- list(formula = y ~ k * e ^ x,
             start = list(k = 1, e = 2))
ggplot(mtcars, aes(wt, mpg)) +
  geom_point() +
  stat_fit_augment(method = "nls",
                   method.args = args)

[Pedro J. Aphalo]

Please, see User Guide 1 for examples using stat_smooth/geom_smooth and stat_fit_tidy.