Hi,
I hope you are doing well. I have experience with NRF52 chips using these boards,
Redbearlab Nano 2
RedBearlab Blend 2
Arduino nRF52 Primo
Nordic nRF52 DK
I have worked with their API,
Developed beacons projects, Server Client Pair Project, IMU sensor Display Project.
I have understood your requirements and would like to discuss the project further.
Looking Forward,
Khawaja