DRV8234: How can I implement sensorless position control for BDC?

Hello,

I’m trying to do implement position control with a BDC motor but hall sensors are expensive and I can’t fit it in my mechanical design, do you have any motor drivers that can help with that?  

Maybe something that can drive a brushed DC motor like a stepper motor with precise position control without a sensor? I saw that there are a couple devices that might work, DRV8214 or DRV8234 but not sure how it works.