Garmin Explore app - British National Grid position format?

Does anybody know how to change the position format to BNG in the explore app? Is it an option??

I have my instinct set to display BNG but can't see any option inside the explore app for this. The only options they seem to have are Degrees, Degrees, Minutes, Deg, Min, Sec, UTM/UPS and USNG/MGRS although you can get the Datum as Ordinance Survey GB??