Hello,
when I was using Xfce, I did manage my msmtp/isync passwords by using libsecret/gnome-keyring service.
After migrating to KDE I read that Kwallet does have support for libsecret, but was not able to retrieve passwords, although it seems I'd have to rework folder for storing them.
Then I've tried with Keepassxc's integration with libsecret service, but was informed that first I would have to disable gnome-keyring. By further inspection I've discovered that few gnome-keyring packages are installed and the process is running.
My question is whether you recommend to keep running gnome-keyring under KDE, to uninstall it and use Keepassxc integration or to try with kwallet?