Probably there isn't information for this in the Forums, but if someone has already asked this from Garmin or for some miracle Garmin rep would comment it would be nice.
Adventure Racing With Garmin Watches | Garmin Customer Support
As if this omission continues, I really need to think that the next watch is then Fenix 8 and ditch the Forerunner series. As some event's have taken stricter stance to GPS-devices and would require to use that mode, but we don't have it in Forerunners.
Or comments that others are also missing this feature.