Unfortunately my watch doesn't support this. I think they introduced it in the X45 Forerunners? Unfortunately I have a 935.
But I did use Train As One last year on the recommendation of @ada@lemmy.blahaj.zone when aiming to beat my 5 k PB. It helped me get below 18 minutes for the first time. I haven't seriously used it since, but I certainly don't regret using it for the 2 or 3 months I was.