how to store data in local?

I have created an application that, given two input points, calls a function that draws a path, on a map, between the two points. I would now like to be able to implement the ability to click on the path and save it locally, in a list, so that I can retrieve it when necessary.

I'm a beginner with programming in kotlin and android, could you advise me how to do it?

I share below the function that I use to create the path in case it is useful.

    fun routePath(p1Latit: Double, p1Laong: Double, p2Latit: Double, p2Laong: Double){
        val roadManager: RoadManager = OSRMRoadManager(context, "lolloMaps")
        OSRMRoadManager.MEAN_BY_FOOT
        val waypoints = arrayListOf<GeoPoint>()
        val startPoint: GeoPoint = GeoPoint(p1Latit, p1Laong)
        waypoints.add(startPoint)
        val endPoint: GeoPoint = GeoPoint(p2Latit, p2Laong)
        waypoints.add(endPoint)
        mapView.overlays.forEach{
            if (it is Polyline && it.id == "Path"){
                mapView.overlays.remove(it)
            }
        }
        road = roadManager.getRoad(waypoints)

        if (road.mStatus != Road.STATUS_OK){
            Toast.makeText(context, "Error - status = " + road.mStatus, Toast.LENGTH_SHORT).show()
        }
        val roadOverlay: Polyline = RoadManager.buildRoadOverlay(road)
        roadOverlay.id = "Path"
        mapView.overlays.add(roadOverlay)
        mapView.invalidate()


        val nodeIcon: Drawable? = ResourcesCompat.getDrawable(mapView.resources, R.drawable.marker_node, null)
        mapView.overlays.forEach{
            if (it is Marker && it.id == "Node"){
                mapView.overlays.remove(it)
            }
        }
        for (i: Int in road.mNodes.indices){
            val node: RoadNode = road.mNodes[i]
            val nodeMarker: Marker = Marker(mapView)
            nodeMarker.position = node.mLocation
            nodeMarker.icon = nodeIcon
            nodeMarker.title = "Passo $i"
            nodeMarker.id = "Node"
            mapView.overlays.add(nodeMarker)

            nodeMarker.snippet = node.mInstructions
            nodeMarker.subDescription = Road.getLengthDurationText(context,node.mLength, node.mDuration)
            // var icon: Drawable = resources.getDrawable(R.drawable.ic_continue)
            // nodeMarker.image = icon
        }
    }