customdata array access issues

I am having issues accessing array elements inside of customdata using traditional JS indexing. The dot property accessor works, but using a key value or a numeric index inside of brackets doesn't seem to work. Here is my minimal reproducible example with only the version that works.

library(data.table)
library(plotly)

# Create sample data set of arbitrary length
n <- 1e3
dt <- data.table(
  x=seq_len(n),
  y=rnorm(n),
  z=1e5*rnorm(n),
  'text_label'=as.character(seq_len(n))
)

# Create customdata -- performance does not scale well with large n (1e6)
customCols <- c('z','text_label') # columns to include in customdata as they are not passed elsewhere
customdata <- split(dt[,.SD,.SDcols=customCols], seq_len(nrow(dt))) # fastest method of splitting data.frame

# Create and print plot
p <- plot_ly(data=dt) %>%
  add_trace(
    x=~x,
    y=~y,
    customdata=customdata,
    hovertemplate='<b>Test Label: </b>%{customdata.text_label}',
    type='scatter',
    mode='markers'
  )
print(p)

Hovertemplates that do not work

hovertemplate='<b>Test Label: </b>%{customdata[1]}',
hovertemplate='<b>Test Label: </b>%{customdata["text_label"]}',

使用 plot_ly()、add_trace()、customdata 以及 issue 中展示的 hovertemplate 变体重现 R 示例。首先跟踪 customdata 如何暴露给 hovertemplate 表达式，然后验证数字索引和键索引的方括号访问是否能与点号访问一起工作。当两个失败的 hovertemplate 形式都显示预期的 customdata 值时，即视为完成。