You will need an XPLR eTap AXS rear derailleur, a cassette in 10-36T, 10-44T, or 11-44T, an AXS 1x chainring, and probably a new road/gravel Flattop chain (as you will likely need a longer chain for the larger cassette).
For more details on the compatibility of AXS components, see our AXS Components Compatibility Map.