Can't use Shift key when customizing key bindings?

[vietan0]

I want to add a custom keybinding and had some success:

"vim.normalModeKeyBindingsNonRecursive": [
    {
      "before": ["<Space>"],
      "after": ["o", "Esc"]
    }, 
]

That works. But this does not:

"vim.normalModeKeyBindingsNonRecursive": [
  {
    "before": ["<Shift-Space>"],
    "after": ["O", "Esc"]
  },
],

I'm not sure what the problem is. I have tried ["<Shift-Space>"], ["<Shift+Space>"], ["<S-Space>"], ["<S+Space>"], ["<S>", "<Space>"], none of them works.

Originally posted by @vietan0 in #9913