Can't share Internet connection from MacBook to iPhone
The question you are asking seems unclear, but I think you are asking if you can share internet connectivity from your computer to your iPhone (or other iOS devices) via Bluetooth.

In this case the answer is no this is not possible, however you can share via Wi-Fi.

You can share (tether) your iPhone, or Cellular iPad's data connections to your computer via Bluetooth, USB or Wi-Fi but not the reverse. 

This article on Apple.com explains the later option