I'm currently using gnome and I'd like to switch to plasma, but I want to be able to intergrate my google and nextcloud accounts like in gnome's online accounts section. How could I do this?
Actually, you add the nextcloud account either in Kaddressbook or in Korganizer/Kalender, or in Akonadi konsole. There was something called "online accounts" in Plasma but I never understood what it was good for, mostly obsolete instant messaging services, but not the integration of Nextcloud. KDE/Plasma has nowhere near the consistency that GNOME has. Sure, it generally offers more functions and options, but it is certainly more messy.