Translate plotmath expressions

I have 2 issues using function ggplotly in R:

Question 1 What are the ways to keep R plotmath expressions while converting ggplot2 plots to plotly format using function ggplotly?

Now the expressions are converted to [object Object] as in this example below:

library(ggplot2)
library(plotly)

qplot(mpg, wt, data = mtcars) +
    ggtitle(expression(bar(x) == sum(frac(x[i], n), i==1, n)))

ggplotly()

Question 2

How to get rid of double labels in the legend of plotly graph and make them look like in ggplot2 graph? I.e. how to get 6 in stead of (6,6):

qplot(mpg, wt, data = mtcars, colour = as.factor(cyl), fill = as.factor(cyl))

ggplotly()

Comece reproduzindo ambos os exemplos relatados com ggplot2 e ggplotly: o título plotmath se torna [object Object], e a legenda mostra valores duplicados como (6,6). Rastreie como o ggplotly converte expressões plotmath e escalas combinadas de colour/fill e, em seguida, verifique se as expressões são renderizadas corretamente e se as entradas da legenda correspondem ao resultado do ggplot2.