Button-card sensor.raspi_xxx

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I tried to use the button-card using the example found in github https://github.com/custom-cards/button-card
that show the status of :CPU,SD, RAM using the senor.raspi_cpu, sensor.raspi_sd, senosrs.raspi_ram.
I didn’t find indication about how to activate this sensors on my raspberry4 with hassio installed.
custom_fields_2
How I can retrieve this info?

Thanks