Feature Request: Size Legend Bubble Chart

I am not sure whether this is the right forum to address the issue. Nevertheless, after quite some searching, I was unsuccessful to figure out a way to add a legend to a bubble chart, that reflects information on the bubble size in a chart like the one below.

library(plotly)
d <- diamonds[sample(nrow(diamonds), 1000), ]
plot_ly(d, x = carat, y = price, size = carat, mode = "markers")

I am looking for something a similar chart legend like in the picture attached.

If I am off topic here, please don´t hesitate to close the issue - a hint to a solution would be highly appreciated, though.

Best
Michael

image source: https://visage.co/data-visualization-101-bubble-charts/

首先使用 plotly 复现提供的 R 示例，并将其气泡大小与所请求的参考图例进行比较。完成的标准是提供一个能够反映图表中 carat 值的气泡大小图例，并针对该示例验证预期行为。