Ctrl+F9 in normal mode.

[kbird05]

Following is working well in settings.json
{
"before": ["<C-q>"],
"commands": [
//"workbench.action.terminal.new",
//"workbench.action.terminal.focus",
{"command": "workbench.action.terminal.sendSequence", "args": {"text": ""C:\Software (x86)\Editors\Vim\vim74\gvim" ${file} +${lineNumber}\r"}},
//"workbench.action.terminal.kill"
]
},
}

However, if I change <C-q> to <C-F9>, it does not working at all.
Could you let me know how I can map to ctrl + function key (f-key)?

Thanks