'Finding the theme element name in Visual Studio Code to change its color

I'm modifying a Visual Studio Code theme to my liking. However, I have problems in finding the correct element name from https://code.visualstudio.com/api/references/theme-color.

Is there an extension or other way to get the specific element to modify the color? Something like "Select the element in the page to inspect it (Ctrl+Shift+C)" in Google Chrome developer console?
To be more specific, I'm trying to find the element name for this purple line to change it to a bit less aggressive color:

Purple border

Any help in finding the element name in general or in finding the name of that element?



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