help: remap fn key nixos-asahi m1

Requirements

[X] I've searched platform-specific issues, issues and discussions to see if this has been reported before.

Describe the bug

I'm not sure how to remap macbook air fn key to left control.

Relevant kanata config

my config:

{ config, pkgs, lib, ... }:

{
  services.kanata = {
    enable = true; # Enable the Kanata service

    keyboards = {
      "internalKeyboard" = {
        devices = [ "/dev/input/event2" ]; # Use the event associated with your internal keyboard

        config = ''
          (defsrc
            grv  1    2    3    4    5    6    7    8    9    0    -    =    bspc
            tab  q    w    e    r    t    y    u    i    o    p    [    ]    \
            caps a    s    d    f    g    h    j    k    l    ;    '    ret
            lsft z    x    c    v    b    n    m    ,    .    /    rsft
            lctl lalt lmet           spc            ralt rmet rctl
          )

          (deflayer default
            grv  1    2    3    4    5    6    7    8    9    0    -    =    bspc
            tab  q    w    e    r    t    y    u    i    o    p    [    ]    \
            caps a    s    d    f    g    h    j    k    l    ;    '    ret
            lsft z    x    c    v    b    n    m    ,    .    /    rsft
            lctl lmet lalt           spc            ralt rmet rctl
          )

          (deflayer dvorak
            grv  1    2    3    4    5    6    7    8    9    0    [    ]    bspc
            tab  '    ,    .    p    y    f    g    c    r    l    /    =    \
            caps a    o    e    u    i    d    h    t    n    s    -    ret
            lsft ;    q    j    k    x    b    m    w    v    z    rsft
            lctl lmet lalt           spc            ralt rmet rctl
          )
        ''; # The config must be a string, written in Kanata's expected format
      };
    };
  };
}

To Reproduce

not really a bug

Expected behavior

replace left fn key with control (so control is left fn and left control key on the built-in macbook air keyboard)

Kanata version

kanata 1.6.1

Debug logs

No response

Operating system

Linux

Additional context