Creating a dashed median line in boxplot

[#1]

I'm creating a boxplot, and I want to have a dashed median line in a boxplot. Please give me show me how to do it. I've tried so many times, but I am not successful. Thank you.

[#2]

Which boxplot? In graph builder or in some other platform?

[#3]

In graph builder. Sorry that I forget to include this detail. 

[#4]

I'm not sure if there are any easy ways of doing this when using the simple box plot graph element.

But you can overlay it with bar chart (float) and get something like this IF you can change width proportion of box plot

You can go a bit further using 2 bar charts, one to hide the black line of box plot (I used white color) and then other to display the line. Note that you might have to change the order of these elements and you might have to adjust the width proportion

@scwise , any other ideas how to modify part of box plot (median line)?