adding arrow keys to ngx-material-keyboard

I am using ngx-material-keyboard/core and I have a requirement to add arrow keys like so, to the right of the standard keyboard:

I was looking through the docs here: https://github.com/joskwanten/core#providing-custom-layouts

and its not clear to me how to achieve this. this is what I tried so far:

export const customTextKeyPadLayouts: IKeyboardLayouts = {
...keyboardLayouts,
'Notes Layout': {
  name: 'Protocol Notes layout',
  keys: [
    [['`'], ['1'], ['2'], ['3'], ['4'], ['5'], ['6'], ['7'], ['8'], ['9'], ['0'], [KeyboardClassKey.Bksp], [''], ['^']],
    [['Q'], ['W'], ['E'], ['R'], ['T'], ['Y'], ['U'], ['I'], ['O'], ['P'], ['['], [']'], ['\'']],
    [['A'], ['S'], ['D'], ['F'], ['H'], ['J'], ['K'], ['L'], [';'], [',']],
    [['Z'], ['X'], ['C'], ['V'], ['B'], ['N'], ['M'], [','], ['.']],
    [[KeyboardClassKey.Space]]
  ],
  lang: ['protocol-notes-text']
},
};```

in the first row of the keys array you can see that I added: , [''], ['^']],

in an attempt to mock the up arrow, but obviously that doesn't lead the desired behavior of moving the cursor up, but instead inserts a caret (^). is there any way to add an arrow control field with the default layouts?

the KeyboardClassKey referenced above only has limited characters, no arrows are available.

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