Hi Rupni.
I have been looking for a long time for a solution to t he Waze/Radio problem and I finally found it!
I have been looking for 10 months
For IPHONE:
"Go to "Settings
"Then "Accessibility
Then "Physical & Motor
Then "Incoming Calls"
Then select "דיבורית"
This will allow you to hear the radio AND get voice promps from Waze.