Group widgets in the sidebar?

Hello!

I was wondering if it is possible to group widgets within the sidebar. Since my sidebar has a lot of widgets and some of these appear only on specific pages and are never changed, the admin page of the widgets looks really long and uncomfortable to work with.
So I wanted to know if there was any way – a plugin maybe – to “group” these widgets in a sort of “sub-sidebar” ?

I do not want to create new sidebars, I have tried the “Widget Entries” plugin and it is the closest to what I want, but it appears as a unique widget and does not group the existing ones.
I hope I made myself clear enough so that someone will be able to help ??
please ??