Little late to the party. Google Navigation SDK allows you to get turn by turn data and manoeuvre events and data. In short here is what I did:

• Create a mobile app which uses Google Navigation SDK where the user initiates the navigation(like you do with Google maps or Waze).

• Inside the app listen to the manoeuver events(Turn right in 30meters). Broadcast this event to the ESP32 device over BLE.

Detailed article here: https://medium.com/@dhruv-pandey93/turn-by-turn-navigation-on-small-displays-9ea171474095