There was something for this in XVM but they are reworking it I belive, called xmqp. Was showing spotting indicator next to friendly player on the list, when he is spotted. But it has some requirements, for example you both need to install XVM and enable xmqp there, actualy everyone in your team would have to install it, otherwise you will never know for sure if they are spotted or not, also everyone in ally team must have 6th sense perk trained.