How to make new customizer sections widgetize?

[ Moved to the Fixing WordPress sub-forum. ]

How do I implement something like this – https://imgur.com/a/kt9mC. I have setup new panel and section, but I don’t know which “wp_customizer_control” will enable a new customizer section into widget “add-able” type like the screenshot. I want “this screenshot like” customizer widget area in my new customizer sections so that users can add/remove/customize widgets as they please.
I know how panel, section, settings, controls work but I’m feeling stupid to ask as I don’t know how to achieve something like the screenshot.