Yes, but the KDE/Plasma key manager is kwallet(manager5).
I would propose to integrate all fetures (and e.g. compatibility) in one app.
See also my proposal:
Many things are there. But kwalletmanager5 isn’t a full functional manager but pretty well integrated.
KeepassXC is more or less the standard and will be used also on other platforms.
OpenKeyChain is a good GnuPG Key Manager and well supporting Password Store
Why not combinig things together which are more or less available.