For SRAM RED AXS 1x cranksets without a spindle-based power meter, we offer power meter spiders that pair to 4-bolt 1x chainrings or to threaded 1x chainrings.
Additionally, we have also developed non-driveside DUB crank arm power meter upgrades for Rival eTap AXS, Force AXS and Apex AXS cranksets. This will allow the rider to simply swap the left hand/non-drive side arm to upgrade to a power meter version of the crankset.
For an overview of our power meter offering, check out our website: Power Meters.