Have you tried creating a custom page with the plasma system monitor?

plasma-systemmonitor

You can create a new page to monitor all your temps, then add rows for each sensor you want to monitor, select the chart type or text and then select the sensor itself.

I’m sure there are plenty of guides on how to set it up to get what you want.

You may need to relog into your account. Recent hacks on lemmy instances meant the admins logged everyone out of their accounts for security. But the app might not gracefully log out for you.