How Can I Customize a Homescreen Icon?

I have a dedicated 4K Movie section and I'd like to change the icon to be a 4K icon. The icons available in SPECIAL:// SKIN/EXTRAS / doesn't not have one. Is there a way to add additional/custom icons there? Or a way to change an icon manually?

I am running Kodi 21.2.0 on libreELEC 12.0.2 I am back to Kodi after 10 years :-) so I'm not fully up to speed on customization, any help is appreciated!
https://imgur.com/8Kn97Wm