I’m trying to render the streamlit-altair chart from this example, so I implemented the following code:

Currently working on a streamlit project,
when I started to make a bar chart with altair, I need a grouped bar graph with a text on top, something like below:

I want to set a black border color to the boxplot of a altair graph, i try to add stroke parameter to black on the encoding chanel but this overrided my red median line to black.