I am developing a google maps application. I added waypoints but I want to give a different icon. (instead of white circles)

here is my request code:

return {

          location: {
            lat: parseFloat(element.per_add_lat),
            lng: parseFloat(element.per_add_long),
          },
          stopover: element.personel_id != -1 ? true : false,
        };

    var request = {
      origin: start,
      destination: end,
      optimizeWaypoints: true,
      avoidHighways: false,
      unitSystem: google.maps.UnitSystem.METRIC,
      travelMode: "DRIVING",
      waypoints: waypoints,
    };
    console.log("waypoint", request);