Sending openCV image via Flask_socketIO to client causes TypeError: Object of type ndarray is not JSON serializable

encode_param = [int(cv2.IMWRITE_JPEG_QUALITY), 90]
result, encimg = cv2.imencode('.jpg', updated_frame, encode_param)
socketio.emit('response_back', {'frame': encimg.tobytes()}, namespace='/test')

var arrayBufferView = new Uint8Array( result.frame );
var blob = new Blob( [ arrayBufferView ], { type: "image/jpeg" } );
var urlCreator = window.URL || window.webkitURL;
var imageUrl = urlCreator.createObjectURL( blob );
var image_id = document.getElementById('imagebox');
image_id.src = imageUrl;