2 factor authentication should be available everywhere including Kirby’s panel.
I had to go with another CMS, because the client demanded it, and there was no plugin or easy way to do 2FA in Kirby. Please add this.
I haven’t tried it, but there is https://github.com/graphicmarket/kirby-2fa
…and of course https://getkirby.com/docs/reference/plugins/extensions/panel-login , but that indeed sounds like a rather complex endeavour to create such plugin from scratch.
Support for 2FA or 2SV (two-step verification, like a verification code sent by e-mail), or even just a Cookbook recipe how to write such plugin, would be valuable.