Can we run snapShot() on a regular NGLViewer object?

I was trying, without success, to render a static image of your beautiful NGLobjects. Ideally, I would like something like this:

```
library(NGLVieweR)

NGLVieweR("5p21") |>
   addRepresentation("cartoon") |> 
   snapShot(fileName = "eg.png")
```

What is the best way to do this currently?
Thanks!