Having trouble setting a key mapping for `neoterm_clear_cmd`

[DevonPeroutky]

Describe the bug
I am attempting to create a keymapping for clearing the terminal. From the documentation, it looks like I should be able to do

let g:neoterm_clear_cmd = ["\<c-9>"]

To set 'ctrl + 9' to be the key combination to clear the terminal. However nothing happens when I execute the combination in Terminal mode or Normal mode

To Reproduce
Steps to reproduce the behavior:

1. Add let g:neoterm_clear_cmd = ["\<c-9>"] in .vimrc
2. Opened a neoterm with :Tnew
3. Execute a few commands
4. press 'ctrl + 9' in normal mode or terminal mode
5. Terminal will not be cleared

Expected behavior
Terminal will be cleared when the key combination passed to g:neoterm_clear_cmd is entered.

Configuration / Versions:

• OS: MacOS
• NeoVim v0.5.0.
• NeoVim Build: Release

Neoterm configuration

let g:neoterm_autoinsert = 1
let g:neoterm_default_mod = 'botright'
let g:neoterm_clear_cmd = ["\<c-9>"]