Feature request: Option for alt text for plotly plot in shiny app

I was recently trying to add alt text for a plotly-based animated plot within a shiny app. I saw that there is a comparatively recent option to add alt text via an alt argument in, e.g., package shiny's renderPlot(). I didn't see anything similar in R plotly. Is it possible something similar could be extended for renderPlotly()?

I was able to get alt text added to my plot via htmltools::tagAppendAttributes() in the UI code, although it took me a bit to get it (apparently) right.

首先跟踪 renderPlotly() 入口点，并比较为 shiny 的 renderPlot() 所描述的 alt 参数行为。现有的 htmltools::tagAppendAttributes() 变通方案展示了所需的结果；完成应意味着能够以等效方式为 shiny 应用中的 plotly 图表提供 alt 文本。