Increasing size of guide bar fonts in 3d surface plots from Plots.ji

In this image I can increase the guide fonts alright but the fonts on the vertical guide bar (starting from 0.4) remains the same and also, is there any way to reduce the height of that guide bar too?

I’m using plotly() backend for Plots.ji in Pluto notebook

Edit 1: colorbar attributes are not reflecting anything
Plots.plot!(colorbar_titlefontsize=20, colorbar_tickfontsize=20)

This attribute is only supported by pythonplot() backend - see here.