Update colorbar suffix in go.Heatmap()

I can’t manage to change the suffix for numbers shown in the colorbar.
This is the plot so far

I want to add the degree symbol ° after the temperature values.
I thought that


might work but apparently it doesn’t. Any idea on how to fix this?


The solution is to search the web for the html code for angle degree.
I found out this one: https://www.toptal.com/designers/htmlarrows/math/degree-sign/
and updated as:


Actually the problem is not the symbol " ° " but any type of suffix. I can’t even add " C " as suffix. Can you please make up a working example of go.Heatmap() with a suffix in the colorbar?