annotation_custom in ggplot not supported by plotly

Hi all,
I have a line of code to draw a rectangle, with a gradient color scheme, onto a ggplot figure using annotation_custom. However, this is not supported (and does not appear) when I make my figure interactive with ggplotly.

I am having trouble finding another solution for making this same shape that appears in the static figure in the interactive figure. Is there a way that ggplotly can support custom annotations?
Thank you!

g <- rasterGrob(matrix(c(bluepal), nrow = 1), 
                                 width=unit(1,"npc"), height = unit(1,"npc"), 
                                 interpolate = TRUE) #make a gradient of blue colors 

annotation_custom(g, xmin=2.7, xmax=7.5, ymin=20, ymax=22)
<img width="379" alt="Screen Shot 2021-08-12 at 6 17 45 PM" src="https://user-images.githubusercontent.com/22037535/129281870-c665dea2-0c82-4818-86e2-24d311578342.png">

Commencez par reproduire l’exemple R fourni avec rasterGrob, annotation_custom et ggplotly, en comparant le ggplot statique avec le résultat interactif. Déterminez si les annotations personnalisées peuvent être prises en charge et vérifiez que le rectangle en dégradé apparaît dans la figure interactive.