Display the values (e.g. power) multiplied by float coefficients in the dashboard

Hello everybody,
I just started using HA for a few days. And I’m not understanding that much, honestly. In the dashboard I see the measured values (eg the power) of the Shelly through the “Entities” card. But now if I wanted to display the Shelly power values, multiplied by the float coefficient of my choice, what can I do? Thanks for any reply.
Claudio