Treemap property for a Billboard.js chart
Arguments
- bb
- A - billboard- htmlwidgetobject.
- ...
- See https://naver.github.io/billboard.js/release/latest/doc/Options.html#.treemap 
Examples
library("billboarder")
data("mpg", package = "ggplot2")
billboarder() %>% 
  bb_treemapchart(mpg[, 1]) %>% 
  bb_treemap(label = list(show = TRUE, threshold = 0.03))%>% 
  bb_data(
    labels = list(colors = "#FFF")
  )