Distance to Start field

https://apps.garmin.com/en-US/apps/35bd7d77-a331-4c15-a84b-3323c34c1a56



Cant find any topic about this field. I use it for every workout (i run in woods). My wife got FR230 i such field would be very very helpful for her. Unfortunetly i think, Tonny Madsen is no longer supporting that field :( It dont have support for FR230 and he dont respond for emails :(

Is someone capable of making very similar field but for FR230?

Thanks!