Use Labella for placing labels on a vertical axis

index.js

import labella from 'labella';

let points = [];
const force = new labella.Force()
                         .nodes(points.map((d) => new labella.Node(d.y, 15, d))) // 15 is label height/spacing
                         .compute();
points = points.map((d) => {
      const matchingNode = force.nodes().find((node) => node.data.id === d.id);
      return {
        ...d,
        labelY: matchingNode.currentPos,
      };
});