r - Space between gpplot2 horizontal legend elements

Question

I have a ggplot2 plot as follows:

library(ggplot2)

ggplot(mtcars, aes(factor(cyl), fill=factor(cyl))) + 
    geom_bar() +
    coord_flip() +
    theme(legend.position = 'top') +
    guides(fill = guide_legend(title=NULL))

I'd like add spacing between the fill elements as follows:

Answer 1

The issue mentioned by alistaire and Tyler Rinker was solved. Now we can adjust the margins of the element_text`.

ggplot(mtcars, aes(factor(cyl), fill = factor(cyl))) +
  geom_bar() +
  coord_flip() +
  theme(
    legend.position = 'top',
    legend.title = element_blank(),
    legend.text = element_text(margin = margin(r = 2, unit = 'cm'))
  )