Unfortunately I don't think that routes exported from Strava contain navigation directions (or at least didn't have them when I last looked a while ago).It’s for this reason I use subscribe to Strava premium (booo) so I have access to heat maps when route planning in areas I don’t know. Import into WOD and good to go. If turn by turn worked on the exported Strava routes that would be a godsend.
This is my worry about the app not adding turn by turn directions to a route: most sources of routes do not include them. Over time I will maintain a list of recommended route generation systems which do include them and which the app supports. And in the future I will probably use map matching to generate directions.