using json file for waypoints for vehicle in unity project.

I'm learning from a project in which manager for vehicle waypoints spawning in using .byte (text file) file for spawning waypoints in game. which is initially made from a json file which is also available is project. The issue is i cant understand $ref. Can someone tell me how can i make a new waypoint file just like this one. {"$content":[{ "Point": { "x": -868.3, "y": -5.800003, "z": -695.1 }, "RoadLinks": [ { "Link": { "Point": { "x": -859.9523, "y": -8.426735, "z": -717.9402 }, "RoadLinks": [ { "Link": { "$ref": "0" }, "SpacerLineWidth": 0.0 }, { "Link": { "Point": { "x": -841.3722, "y": -5.483482, "z": -700.2738 }, "RoadLinks": [ { "Link": { "$ref": "2" }, "SpacerLineWidth": 0.0 }, { "Link": { "Point": { "x": -858.9, "y": -5.335197, "z": -675.2 }, "RoadLinks": [ { "Link": { "$ref": "5" }, }, { "Link": { "Point": { "x": -150.9, "y": 1.709984, "z": -730.1 }, "RoadLinks": [ { "Link": { "$ref": "339" },

     },
     {
         "$ref": "650"
     },
     {
         "$ref": "653"
     },
     {
         "$ref": "655"
     },
     {
         "$ref": "657"
     },
     {
         "$ref": "659"
     },
     {
         "$ref": "661"
     },
     {
         "$ref": "663"
     },
     {
         "$ref": "668"
     },
     {
         "$ref": "670"
     },
     {
         "$ref": "672"
     },
     {
         "$ref": "674"
     },
     {
         "$ref": "687"
     },
     {
         "$ref": "690"
     },
     {
         "$ref": "693"
     },
     {
         "$ref": "696"
     },
     {
         "$ref": "699"
     },
     {
         "$ref": "702"
     },
     {
         "$ref": "711"
     },
     {
         "$ref": "722"
     },
     {
         "$ref": "726"
     },
     {
         "$ref": "742"
     },
     {
         "$ref": "744"
     },
     {
         "$ref": "749"
     },
     {
         "$ref": "752"
     },
     {
         "$ref": "755"
     },
     {
         "$ref": "757"
     },
     {
         "$ref": "759"
     },
     {
         "$ref": "763"
     },
     {
         "$ref": "765"
     },
     {
         "$ref": "770"
     },
     {
         "$ref": "773"
     },
     {
         "$ref": "775"
     },
     {
         "$ref": "778"
     },
     {
         "$ref": "780"
     },
     {
         "$ref": "782"
     },
     {
         "$ref": "788"
     },
     {
         "$ref": "791"
     },
     {
         "$ref": "793"
     },
     {
         "$ref": "796"
     },
     {
         "$ref": "798"
     },
     {
         "$ref": "800"
     },
     {
         "$ref": "802"
     },
     {
         "$ref": "805"
     },
     {
         "$ref": "809"
     },
     {
         "$ref": "868"
     }],"$type":"Game.Traffic.RoadPoint[]"}