Datatable: apply different formatStyle to each column

I want to apply formatStyle function to different columns in my table. I can easily apply the same style to all the columns, or to some subset of columns, e.g.

divBySum <- function(x) x/sum(x)

  output$test <- DT::renderDataTable(
    datatable(mutate_each(mtcars, funs(divBySum)),
      options = list(searching = FALSE,
                     paging = FALSE,
                     dom = 't'),
      rownames = FALSE) %>%
      formatStyle(colnames(mtcars),
                  background = styleColorBar(c(0, 1), 'lightgray'),
                  backgroundSize = '98% 88%',
                  backgroundRepeat = 'no-repeat',
                  backgroundPosition = 'center') %>%
      formatPercentage(colnames(mtcars))
  )

However I would like to apply different formatStyle to each of the columns. For example, I would like to define maximal length of bar to styleColorBar(c(0, max(x)), 'lightgray'), where x is a column, or different colors for them.

I would like to do this with some function that takes as input a vector of column names. Is there any nice, clever way to do this?