Despite this being piloted in Germany, there's still a way to access and enable this setting (although it only currently works in private windows). Thanks to Michael Veale[1] for bringing this to my attention:
> Go to the URL about:config
> Set cookiebanners.ui.desktop.enabled ->True
> Go to Settings->Privacy, turn on Cookie Banner Blocker.
[1] https://someone.elses.computer/@mikarv/111538624638087626