Is it heavy on HA to store these values in DB and plot them?

HA is running on Intel® Pentium® E5200 2 GB DDR2-SDRAM + SSD

No, it isn’t. It’s only 8 values.

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do you think it is possible to use the card? if so what is the name?

This is generated by the system, it’s not a lovelace card.

You can try out the custom bar-card, with a bit of styling it looks exactly like the system generated one.