Is your feature request related to a problem? Please describe.

Currently, the override manager only allows to create overrides for JLayouts based on the second directory level. Probably worst example being /joomla/content (29 layouts including two subfolders).
It doesn't allow to select a single layout.
It doesn't allow to select a deeper folder (eg /layouts/joomla/content/icons)
it doesn't allow to select "level1" folders (eg /layouts/chromes)

Describe the solution you'd like

I'd like a more flexible manager which allows to create overrides for a single layout or folder regardless of its position in the directory tree.

Additional context

With module chromes now using JLayouts (see #23570) that becomes even more interesting as currently you can't create overrides for module chromes in that manager.