Add liquid chlorophyll ‘mint flavor’ to your water/diet. It is good for mucous/circulatory issues, blood purifying, and over all digestion aid.
You also may want to try an essential oil called Copaiba. I use Young Living brand. I do not have asthma but this oil has “strong antiseptic and expectorant for the respiratory tract.”
I used it for covid adding 6 drops to 4 oz of warm water and gargled with it swallowing a bit in between (common Peruvian Dr. Prescription) , it worked amazing! It is basically a tree resin from a tree in Brazil. It also works good for pain, bonus sabonus!
Cheers