Lo han is my favorite tea  for any kind of lung issues that I’ve had through the last many years, like dry throat and cough, I really feel like it lubricates my lungs and throat. 
I also used it a lot during my corona sickness for voice hoarseness. That was so helpful. 
You take a slice of the dry fruits and cook it in water for 10 min. And then drink. It is sweet and sooooo sooothing for the throat and lungs :) 
If you want to cook the whole fruit you probably will need 2-3 liters of water. 
I also red that according  to Traditional Chinese Medicine this “fruit” is used for phlegm in the lungs, constipation, acute bronchitis…