Outputs are matched by connector name (i.e. eDP-1, HDMI-A-1), or by monitor manufacturer, model, and serial, separated by a single space each. You can find all of these by running niri msg outputs.
vg - variation graph tool, vg version v1.70.0 "Zebedassi". vg is a toolkit for variation graph data structures, interchange formats, alignment, genotyping, and variant calling methods. For more ...