How to add a completely customized legend to a bubble chart

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I’m not sure if this is possible in plotly. A while ago I tried some similar stuff:

Scatter plot with two legends

I would like to plot two continuous variables as a scatter plot, and more specifically, segment this data using two categorical variables: one categorical variable controls the marker color, and the other categorical variable controls marker size. I would like to generate one legend based on marker color, and one legend based on size. Is this possible in Plotly? It would be pretty straightforward in Matplotlib. I can show the x,y coordinates, and the color / size values in the hovertemplate,…