feature/question: group highlight for already mapped trigger key

[thecontinium]

Did you check the docs?

• [X] I have read all the which-key.nvim docs

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

When you have mapped keys for say 'g', 'gs' there is no way of seeing that the mapping 'gs' exists. Is there a way to make the 'g' mapping be highlighted as a group ?

Describe the solution you'd like

The mapping for 'g' highlighted as a group.

Describe alternatives you've considered

.

Additional context

No response