Feature Suggestion: Nested Groups to allow fine-tuned organization

[hced]

I've been trying to organize my chords after specific purposes. Main overlay:

1 → +9 Loops and Flow
2 → +2 Smooth and Relax
3 → +2 Shape and Deform
4 → +3 HardSurface operations  ⇐ this group is an example that I'll discuss below
a → Screen Space Align
b → +4 Mesh
c → Circle
f → Flatten
h → +1 hced operators
x → Scripts
p → Song Chord Prefs
tab → Quick Favorites

Under "HardSurface operations", I want vendor-specific chords. But instead of having a long flattened list of operators, I'd like to show vendor groups like so:

k → +8 Kushiro
m → +4 MACHIN3
o → +3 TeamC

Currently, without nested groups, I'd have to show all vendors on the main page:

1 → +9 Loops and Flow
2 → +2 Smooth and Relax
3 → +2 Shape and Deform
4 → +3 HardSurface operations
a → Screen Space Align
k → +8 Kushiro ⟸ unclear purpose
m → +4 MACHIN3 ⟸ 〃
b → +4 Mesh
c → Circle
f → Flatten
h → +1 hced operators
o → +3 TeamC ⟸ 〃
x → Scripts
p → Song Chord Prefs
tab → Quick Favorites

This gets messy quickly—especially with many addons. I could create groups by purpose, but then I still can't sort operators per vendor. The only workaround is prefixing chords with vendor names (e.g., "Kushiro: Grid Modeler"), which is clunky.

So, I'd love nested groups. The cleanest implementation: a new operator like chordsong.group_enter that takes one string argument, corresponding to group names. If the operator is used, the keymap count should be reflected in the overlay.