[Question] Custom icons not from font packages

[VoidWa]

Hello.

I want to install more informative icons for the PulseAudio module to show not three levels, but four. But in fonts font-awesome and nerd-fonts the icon I need is missing... I have to make the icon I need and patch the font package, but this is long and difficult for me!

Can I use icons that I make in inkskape, but without patching the font package? If so, how? My config looks almost default:

"pulseaudio": {
    "format": "{volume}% {icon}",
    "format-bluetooth": "{volume}% {icon}",
    "format-muted": "",
    "format-icons": {
        "alsa_output.pci-0000_00_1f.3.analog-stereo": "",
        "alsa_output.pci-0000_00_1f.3.analog-stereo-muted": "",
        "headphone": "",
        "hands-free": "",
        "headset": "",
        "phone": "",
        "phone-muted": "",
        "portable": "",
        "car": "",
        "default": ["", "", ""]
    },
    "scroll-step": 1,
    "on-click": "pavucontrol",
    "ignored-sinks": ["Easy Effects Sink"]
}