Keymap to list keymaps for insert, visual, command mode?

[cmon1701]

The manual states: "don't create any keymappings yourself to trigger WhichKey. "

But what are the keymappings for
:WhichKey '' v "show ALL mappings for VISUAL mode (as stated in the manual)
:WhichKey '' i | show ALL mappings for INSERT mode (I found out this)
:WhichKey '' c | show ALL mappings for COMMAND mode (I found out this)
:WhichKey '' R | show ALL mappings for <WHAT!?> (I found out this)
(Maybe there exist some more :WhichKey <…>)

If they don't exist, they should be created, just as in insert mode and shows the registers.
I would like to have a keymapping in normal mode that lists all mappings for INSERT mode etc. (see above).