KSysGuard is Plasma's system monitor tool.
It can create customised tabs which show graphs from your computer's sensors.
Please add cateogry called System Monitor Tabs
It needs to accept the XML format used by KSysGuard, see examples in your .local/share/ksysguard
Bug on ksysguard side https://bugs.kde.org/show_bug.cgi?id=338669