A beep for speed data block reaching a custom set value

When I'm practicing a track it would be of great help if the "speed" data block allowed me to set a certain value upon which the control would beep to indicate to me that I reached the desired value. This wold be very useful in trying to learn to make corners at certain speed (e.g. if I know that it's possible to make the corner at 150km/h and I consistently tend to make it slower, the beep would signal to me to release the break to maintain the desired speed. I think this control would be the most useful training tool. Thank you.