Sadly, GL.iNet Wi-fi 6 routers seem to have no official openwrt support. None of their devices are listed here: https://openwrt.org/toh/views/toh_available_16128_ax-wifi

There seems to be some experimental openwrt build for GL.iNet Flint (GL-AX1800), but it still has some issues with fans: https://forum.openwrt.org/t/gl-inet-ax1800-new-router-openwr...