SUMMARY
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Add the ability to monitor values for a single process
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Now KDE Plasma System Monitor can monitor values only for all running processes: total applications memory usage, total CPU usage, etc.

But sometimes we need to track the exact process (or group of processes) for the history of CPU and Memory usage, and seems there are no ways to do this for now?

Now we can see a chart of last several seconds of CPU usage in the "Applications" table in the background of the "CPU" column, but seems that's all.

So, will be good to give us the ability to add sensors for a specific process (by name, or pid), is it hard to implement?