feature: Ability to highlight letters inside the description

[sandorex]

Did you check the docs?

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

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

I wish to highlight the mapping letters inside description of the keys for easier remembering if that makes sense

Describe the solution you'd like

Ability to bold or change color of letters like with & prefix
For example, description &LSP &Definition to be shown as LSP Definition or LSP Definition as a reminder that the keymap is <leader>ld for example

Describe alternatives you've considered

There are many different ways to do this, maybe use a popular option square brackets [] like so [L]SP [D]efinition

Additional context

No response

[github-actions]

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