data <- list(
  labels = c("Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat", "Sun"),
  datasets = list(
    list(name = "R", values = runif(8, 0, 100)),
    list(name = "Python", values = runif(8, 0, 50))
  )
)

tags$script(
  id = "data",
  type = "application/json",
  htmlwidgets:::toJSON(data)
)

let data = document.getElementById('data')
data = JSON.parse(data.textContent)

const chart = new frappe.Chart("#chart", {  // or a DOM element,
                                            // new Chart() in case of ES6 module with above usage
    title: "My Awesome Chart",
    data: data,
    type: 'line',
    height: 250,
    colors: ['#7cd6fd', '#743ee2']
})