No, the SRAM Rival power meter measures the output of the rider's left leg, which is then doubled to produce a total wattage value. Alternatively, spider based Quarq and SRAM power meters measure both legs to calculate total watts.
Read more about the Rival AXS power meter here: Upgrade to Power On Rival Etap AXS.
Check out the Rival AXS Power Meter Upgrade or Quarq and SRAM's spider based offerings to find the power meter that's right for you and your budget.