Save json with nodes order

GoJS
2

I just found this [SOLVED] Get the sort order of the Swimlanes - #7 by simon
Would that mean that I need to keep&save the index myself manually based on a “loc” sorting function ?

In Pool layout, something like:

    getLanesByOrder() {
        const pool = this.group;
        const lanes = [];

        pool.memberParts.each( (lane) => {
            if (!(lane instanceof go.Group)) return;
            lanes.push(lane);
        });

        return lanes.sort((lane1, lane2) => {
            const y1 = lane1.location.y;
            const y2 = lane2.location.y;

            if (y1 < y2) {
                return -1;
            }
            if (y1 > y2) {
                return 1;
            }
            return 0;
        });
    }

Then loop each lane memberParts and each node with findNodesOutOf and so on…